OTHER SUSTAINIAC WEBSITE PAGE LINKS: The overall site map is at the very bottom of each page, including our email address, phone number, shipping address etc.

BRIEF OVERVIEW OF THE SUSTAINIAC â STEALTH PRO SUSTAINER

The Sustainiac Stealth PRO sustain system is our latest sustainer, introduced in late 2007. It replaced the now-obsolete Stealth PLUS. The kit price is still $229.00 plus shipping for the 6-string version, or $249.00 for the new 7-string version. This includes all parts, controls, driver, and circuit board. Options are available. You can order directly from us from anywhere in the world, using the link to the ORDER FORM at the bottom of this page. We take Paypal, Visa, Mastercard, money order, USA checks. The Stealth PRO must be installed into your guitar. Installation reqires considerable electronics skill, and can take from 3 to 12 hours or even more for very difficult guitar models. Options and more detailed prices are shown on the ORGANIZE YOUR ORDER page, or the SECURE ORDER FORM (link is at the bottom of this page).

Like the obsolete Stealth PLUS, the new Stealth PRO is designed and manufactured by Maniac Music Inc., Indianapolis, Indiana, USA. You can get screaming feedback sustain at any volume at home, in the studio, or on stage. You can "morph" the sustained string vibration into cool-sounding upper harmonics during a solo, by using the Harmonic Mode control. This allows you to give your solos character and originality in a way that was previously only possible by getting feedback from your amp at dangerously loud levels. It is similar to amp feedback, except that the feedback sustain is more predictable and much easier to achieve.

The Sustainiac Stealth PRO sustain system drives the strings of an electric guitar into infinite feedback sustain of string vibrations by electromagnetic feedback. You control the feedback sustain by simple hand muting. Also, you don't have to blast your ears with dangerous sound levels of a large amp. It doesn't change the tone of your guitar pickups or output signal, because it operates directly on the instrument strings. Hear examples on the SOUND PAGE. Go to the PERFORMANCE SECTION for more info on using the Sustainiac Stealth PRO sustainer in performance.

The Sustainiac Stealth PRO contains the following features (more details in the next section):

• SUSTAINIAC DRIVER: The Sustainiac driver replaces your neck pickup. Choose single-coil size driver, or humbucker size. Choose black or white driver (black only for new 7-string driver). The Sustainiac has an ON/OFF control and also a HARMONIC MODE control. Dimensions etc. are shown in the next section below.
• SUSTAINIAC CIRCUIT BOARD: The Sustainiac circuit board can be installed into most electric guitar electronics cavities with little or no routing. It will take 3-12 hours to install, depending on your skill as an electronics technician.
• SUSTAINIAC CONTROLS: Each kit comes with an ON/OFF control and also a HARMONIC MODE control. Choose between toggle switches or push-pull switches (or some other options). More about these below. We added a new sustainer DRIVE CONTROL OPTION for customers who use a TOGGLE SWITCH for Harmonic Mode control. You can use this option or not. Your choice. For push-pull Harmonic Mode control, you already have a built-in Drive control.
• NECK PICKUP SOUND OPTION: We added a couple of wires that can be grounded by a simple DPDT switch to turn the neck pickup single-coil sound to a darker, louder (6dB) humbucker sound. Now, you can get more flexibility from the active neck pickup function of the Stealth Pro.

A list of DETAILED TOPIC LINKS is contained at the bottom of this page. These are links to various pages that go into detail about certain aspects of installing and using the Stealth PRO. An INSTALLATION PAGE contains installation explanations and diagrams for specific guitar types and models. This page is linked frequently in the website, because it is so important. It also tells you about things that might make a guitar unsuitable for an electromagnetic sustainer. When you think you might be about ready to order, there is a page for Organizing your order. This organization outline should help to eliminate the confusion that often arises over the many available options.

The sustainer taps in to your bridge pickup signal (without changing in any way the signal that goes on to your guitar amp), amplifies and processes this signal, then sends this amplified/processed bridge pickup signal to the magnetic string driver transducer. The transducer sends out magnetic pulsations in response to the bridge pickup signal. These magnetic pulsations cause the string vibrations to be sustained. When the sustainer is OFF, the driver transducer functions as an active neck pickup. When the sustainer is ON, the bridge pickup is automatically selected, bypassing the pickup selector switch. When the sustainer is OFF, the pickup selector switch and the rest of your guitar function as before.

For an in-depth discussion of how this is accomplished, go to the OPERATING PRINCIPLES page. This PDF file shows the specific differences between the Stealth PRO and Stealth PLUS.

The Sustainiac Stealth PRO has evolved from our earlier electromagnetic sustainers GA-1, GA-2 (late 1980's, installed into thousands of Hamer, GTX (Kaman), and Fernandes guitars), Sustainiac Stealth model (1999), and Stealth PLUS model (2001). Starting with the Stealth kit in 1999, we began making our kits "stealthy", with the controls separate from a small microelectronics circuit board. This allows you to install the unit into most electric guitar models without having to do any routing. So, you can restore the guitar to its original condition if you want. Our sustainers are the only commercially available sustainers with this capability.

We set out to design the Sustainiac Stealth series of sustainers to solve the main problems of all previous sustainers. This included both problems of sustainer performance, and also practical problems with doing the installation into existing guitars. The new Stealth PRO can be installed into most popular electric guitars with NO ROUTING in most cases, or minimal routing. We have revolutionized magnetic sustainers with the Stealth PRO sustainer and its predecessors.

Many people mistakenly refer to our "Sustainiac pickup", because all they see from the front of the instrument is the magnetic string driver. This driver does resemble a pickup in appearance. But the Sustainiac Stealth PRO sustainer is much more than this. It is actually an electromagnetic sustain system that contains three main parts. View a PDF file of the operational diagram. The Stealth PRO kit picture shows the circuit board and other kit components: Low resolution kit pix (8kb); High resolution kit pix (71kb)

INSTALLATION KIT CONTENTS AND PRICES

The installation kit sells for $229 plus shipping. ($249 for 7-string version) This includes all parts, controls, driver, and circuit board. Options and more detailed prices are shown on the ORGANIZE YOUR ORDER page, or the SECURE ORDER FORM (link is at the bottom of this page). You can order directly from us. We take Paypal, Visa, Mastercard, money order, USA checks. A photo of the kit can be viewed: Low resolution kit pix (8kb); High resolution kit pix (71kb)

1. ELECTROMAGNETIC STRING DRIVER TRANSDUCER: Click here for driver options picture: Low resolution driver pix (11kb); High resolution driver pix (55kb)The driver usually replaces your neck pickup. In some applications it can replace the bridge pickup. It can not replace a middle pickup in a 3-pickup guitar, however. It will be too close to the other pickups, and the sustainer performance will be severely affected. We need 3 inches MINIMUM spacing between bridge pickup and Sustainiac driver (measured center-to-center). 3.5 inches is even better. The driver emits electromagnetic pulsations in response to the instrument string vibrations. These electromagnetic pulses cause the string vibrations to sustain by magnetic force. When the sustainer is OFF, the driver functions as an active neck pickup. One of the two "trimpot"controls on the circuit board allows you to set the neck pickup volume to match most any bridge pickup on the market. One new feature of the Stealth PRO is that the active pickup sound can be set for a bright, single-coil like sound (although it is hum-canceling), or a darker humbucker sound by connecting a wire to ground. You can also boost the output level by 3dB by connecting another wire to ground. Or, a switch (toggle or push-pull) can be installed so that you can switch back and forth between these sounds. Drivers are available in single-coil (SC) size or humbucker (HB) size. Color choices are black or white. (Black only for 7-string driver) You choose the size and color when you order. The HB-size driver is identical to the SC-size driver, except for the size of the baseplate that it is mounted on. Also, we stick a plastic "dummy" cover onto the HB driver cover to make it look more like a regular humbucker pickup. Both the HB and the SC driver have identical sound as a pickup, because this is determined on the circuit board. They also both perform identically as a driver.

   DRIVER SIZE:
   SIX-STRING DRIVER: The driver height is 0.85 inches (21.6mm) for both HB and SC. HB baseplate width is 1.375 in. (35mm), SC width is 0.7 in. (17.8mm). Length of HB is 3.325 in. (84mm), SC is 3.23 in. (82mm). See PDF file for COMPLETE DRIVER DIMENSIONS.
   SEVEN-STRING DRIVER: The driver height is 0.85 inches (21.6mm) for both HB and SC. HB baseplate width is 1.375 in. (35mm), SC width is 0.7 in. (17.8mm). Length of HB is 3.73 in. (94.7mm), SC is 3.75 in. (95.3mm).

   ABOUT THE PICKUP SOUNDS: SINGLE COIL SOUND: The sound is very similar to a Strat neck pickup, but with virtually no hum. The blend of the neck pickup with a typical single-coil middle pickup does not give as good a "quack" sound as a real single-coil combination, but the main "quack" sound is the bridge/middle combination anyway. Blues players tend to love the neck pickup sound. HUMBUCKER SOUND: The humbucker sound is very fat, similar to a stock "59" sound, but can have much higher output if you turn the trimpot control up high. Also, it has noticeably less hum than a typical passive humbucker. You can make it darker by adding a resistor or pot between one of the circuit board wires and ground (see Installation page for specific info on this).

   The driver design of the Sustainiac Stealth PRO is unique. Its patented bilateral design makes magnetic field cancellation from the driver nearly perfect. This means we can set the sustainer gain higher than with other sustainers in the marketplace before the closed feedback loop oscillates (squeals). This is the main thing that sets the Sustainiac sustainers apart from all of our competition, achieving strong, consistent sustained string vibration with most all guitar types. Read the many unsolicited user reviews on HarmonyCentral.com and various chat-groups.

2. CIRCUIT BOARD: The Stealth PRO circuit board measures 3.75in. x 1.1in. x 0.5in. thick (95mm x 28mm x 12.5mm). It runs on a single 9-volt battery. You install the board inside the electronics cavity of your electric guitar. It must be electrically connected to your pickup selector and sustainer controls. Complete installation instructions and diagrams come with each kit. The circuit high impedance input is connected to your bridge pickup. It amplifies the bridge pickup signal, and does other electronic processing to it. It then applies this amplified, processed bridge pickup signal to the electromagnetic driver. Your raw bridge pickup signal goes on to your other guitar effects, amp, etc. with no processing or change in its original sound. When the sustainer is OFF, an amplifier circuit on the board amplifies the driver signal, enabling it to be used as an active neck pickup. Click here for a wire function diagram, showing the function of each color-coded wire. When the Sustainiac is OFF, the Sustainiac driver is used as an active pickup. The sustainer circuit now amplifies the tiny driver pickup signal to a useable level. Pickup equalization is is done on the circuit board. Two wires are provided to allow switching between single-coil (SC) and humbucker (HB) sound. These are the white/violetwires on the 10-pin connector. If you connect the white wire to ground, it boosts the gain by about 4 dB. Connecting the violet wire to ground rolls off the highs. If neither wire is connected to ground, then the default sound is SC. If you want to use this function to switch between SC and HB, simply connect both wires to ground with a toggle or push-pull switch.

   The Stealth PRO uses a unique, patented "class D" amplifier to drive the strings into intense sustained vibration, while using only a small amount of power from the 9-volt battery. It is the combination of this circuitry along with the patented bilateral driver that sets the Sustainiac Stealth PRO apart from our competition. You get stronger, more consistent sustain from instrument to instrument.

   
   

3. CONTROLS: The Stealth PRO kit comes with two main sustainer controls for the front of the guitar body, and also three screwdriver-adjust "trimpots" on the circuit board for one-time adjustment:
   GUITAR BODY: (1) ON/OFF; (2) Harmonic Mode;
   You have the option of choosing either push-pull pot/switch controls, or toggle switch controls for these. Or, you can choose one of each. Other "esoteric" control options are described on the CONTROLS page. This combination of separate controls and small circuit board (with no routing required in most installations) further sets us apart from the competition. It makes for a stealthy installation. If you want to restore the guitar to its original form and function in the future, you can do so.

   TRIMPOT CONTROLS: Screwdriver adjust on circuit board: (1) Sustainiac gain; (2) Neck pickup volume; (3) Harmonic Mode gain, new mini-pot (July 2009) allows you to set gain of Harmonic mode only

   On/Off Control
   When the sustainer is turned ON, the bridge pickup is automatically selected, regardless of the position of the pickup selector switch. It HAS to be this way, because the driver must be physically distant from the pickup that provides the input signal to the sustainer. Otherwise, uncontrolled oscillation (squealing) occurs. (Similar to having a microphone too close to the speakers in a PA system.) When you turn it OFF, the pickup selector goes back to normal function.

   Mode Selection
   Sustained string vibration can be "morphed" into different cool-sounding harmonic modes. This enhances your solos in ways that were not previously possible. You get all 3 modes (see below) whether you choose the standard push-pull control, or the 3-position toggle control. The push-pull control option allows the same control to serve as a sustain intensity control, and also produce all 3 harmonic modes. With the 3-position toggle option, you can add an optional sustain intensity control pot (new feature with the Stealth PRO).

   Normal Mode: Sustained string vibrations occur in the "normal" way that you get when you pluck a note. The technical term for this is the fundamental vibration mode, or 1st harmonic. For the PUSH-PULL control, it is pushed in, and rotated full clockwise. Click for notes in Normal Mode.
   Harmonic mode: All sustained notes morph into a high harmonic vibration mode. It will usually be a 5th or 7th harmonic. For the PUSH-PULL control, it is pushed in, and rotated full counter-clockwise. Click for notes in Harmonic Mode
   Mix mode: This is actually a second harmonic mode, with a different set of harmonics. We call it MIX mode because some frets yield fundamentals, while others yield harmonics. Notes below the 12th fret will mostly morph into 2nd or 3rd harmonics. Above the 12th fret on the little e or b strings, most notes will stay as fundamentals in Mix mode. For the PUSH-PULL control, it is pulled out, and rotated full clockwise.

The Sustainiac ON/OFF push-pull control uses only the switch portion of the control. Therefore, its pot portion functions as the original guitar control that it replaced. The HARMONIC MODE control uses both the pot and the switch portion of the control, so the control that it replaces goes away. For a 2-pot guitar, you will lose either the volume or the tone control, unless you are willing to drill a new hole. If you choose toggle controls, you will likely need to drill new holes in the front of the instrument. Go to the CONTROLS SECTION for more info on the different options for Sustainiac Stealth PRO sustainer controls.

9-VOLT BATTERY AND OTHER POWER SUPPLY OPTIONS
You will get about 15-40 hours on an alkaline battery, depending on how much you actually use the sustainer. Don't use the cheaper "dry-cell" or "long-life" (actually just a dry cell). These are a little less expensive than alkaline, but the shelf life is only about one year, and they lose capacity much faster than alkaline. You pay less for total "sustain time" using alkaline. A 9-volt alkaline battery has about 500-600 milliampere hours of energy. When the sustainer is sustaining a note, battery current drain is about 50 milliamperes (ma). So, you should be able to hold a long note for about 10-12 hours. Call Guiness BWR first! When hand muting with the sustainer ON, current drain is about 10ma. When the sustainer is turned off, current drain for the active neck pickup is about 2ma. You can get a good estimate from this info. No battery current is consumed until you plug a mono guitar cord into the guitar output jack. DO NOT PUT TWO BATTERIES IN SERIES TO MAKE 18 VOLTS. Certain components on the Sustainiac circuit board might fail. Also, the neck pickup only functions between 7 and 10 volts.

DEAD BATTERY INDICATION: When the battery voltage decays to about 7 volts, the neck pickup will stop functioning. At this time, the battery is almost "dead". The sustain function will continue down to about 5 volts, and will get weaker and weaker as the voltage continues to decay. Strange pulsations are also likely to occur at this low voltage. If you take the battery out (or it dies), the bridge pickup will continue to function. The bridge pickup is direct wired to the pickup selector. So, you never lose its function and become "stranded" at a gig.

OTHER POWER OPTIONS: Link to the POWER SECTION for more details on this subject.
RECHARGEABLE BATTERIES: Most NICAD "9-volt" batteries are actually only 7.2 volts. These are unacceptable. Some newer NiMH (nickel-metal-hydride) batteries are 8.4 volts or 9.6 volts. The 9.6 volt is better than 8.4 volt. They don't hold charge as long as a 9-volt alkaline, but you get the advantage of recharging. There are starting to be newer technologies on the market, such as Lithium-ion. These should be OK, as long as they are a true 9 volts.

USING WALL SUPPLIES ("WALL-WARTS"): You must use a REGULATED supply of 9.0 volts. Most "wall-wart" supplies are UN-REGULATED. This means that they put out 9 volts AT RATED CURRENT. At less current, their voltage goes up to as much as 12 to 14 volts. DON'T USE AN UN-REGULATED SUPPLY. We sell a regulated 9 volt supply for $25. You will have to install a connector on your guitar to accept the supply.

INSTALLATION INTO YOUR GUITAR:

Installation is not a trivial task. It requires experience with electronics, soldering, following wiring diagrams etc. It will usually take between 3 and 12 hours, depending on the guitar type and the skill/experience of the installer. If you are not experienced, we recommend that you have an experienced technician do the work, or send it to us.

Refer to our INSTALLATION PAGE for more details on specific guitar models. Lots of ideas are presented, and also hookup diagrams for most common guitar types.

A detailed, illustrated installation manual is included with each Sustainiac Stealth PRO sustainer kit. Click here for a PDF file of our 8-page installation book that we include with each kit.

NOT-RECOMMENDED GUITAR TYPES AND OTHER PROBLEM SETUPS:

1. Any guitar with more than 24 frets: Use another guitar. The space between the bridge pickup and Sustainiac driver is quite small. This creates magnetic crosstalk between driver and bridge pickup, resulting in uncontrolled oscillation. This means that you have to turn the sustainer gain down to stop the resulting oscillation. Sustainer performance suffers so much that you might as well not even have a sustainer. We need 3 inches MINIMUM spacing between bridge pickup and Sustainiac driver (measured center-to-center). 3.5 inches is even better.
2. Placing the driver in the middle pickup position: The problem is the space thing again, between driver and bridge pickup.
3. Any guitar with a slanted neck pickup. Use another guitar. The slant will compromise the magnetic balance between the Sustainiac driver and the bridge pickup. You have to turn down the sustainer gain so much to stop the resulting oscillation that you might as well not even have a sustainer.
4. Telecasters with single-coil bridge pickup. Use another guitar. The extreme slant of the bridge pickup will compromise the magnetic balance between the Sustainiac driver and the bridge pickup. Use of the magnetic-balance tab will not fully correct this. Harmonic mode will generally not be very good.
5. Incompatible bridge pickups: Our "bilateral" driver design works great with most common bridge pickup designs, including most active pickups (such as EMG etc.). Some bridge pickup designs are not compatible and cannot be successfully used. Good magnetic cancellation is not possible, and sustainer performance will be compromised. Novel new pickup designs continue to be developed by clever people. Some are not compatible. This is no criticism of the quality of these pickups. It is merely a statement of how well the Sustainiac will work with these pickup types used to furnish the input signal to the Sustainiac.

   Examples of INCOMPATIBLE bridge pickups:

   • Offset pickups, like G&L Commanche, or "P"-bass type pickup. (Some of these are concealed by a permanently-attached plastic top. The only way to tell is to use a permanent magnet to determine its polepiece configuration.) The Duncan "Vintage Rails" is a split pickup with this type of appearance.
   • Neo-Vin model Neo-9 neodymium pickups (which looks like a normal single-coil or stacked design pickup, until you remove the cover and see a dual rail design with non-magnetic "dummy" polepiece arrangement attached).
6. Using the middle pickup for Sustainiac input signal, or listening to it.: The middle pickup will then provide the input signal to the sustainer (if it is blended with the bridge pickup signal). The system will oscillate (squeal). However, if you connect the bridge pickup to the sustainer input, and listen only to the middle pickup (without blending it with the bridge pickup signal), you can listen to the middle pickup. The signal will likely have some distortion in it because of its proximity to the driver.
7. Pickguards with aluminum or copper "mirror" effects, or some metallic finishes on the guitar body: The magnetic pulsations from the driver induce pulsating "eddy" currents into the conductive aluminum or copper. These in turn radiate their own magnetic pulsations. The bridge pickup responds to these magnetic pulsations. The end result is that the desired magnetic balance between driver and bridge pickup is compromised. We remove the shielding foil that comes on US-made Strats and Jems from around the pickups. You can keep the foil over the electronics cavity. If we do your installation into a Strat, Jem, etc., then we include this service.
8. Metal pickup trim rings: Some times this is OK, and sometimes it produces the same problem as #6. If you experience distortion or uncontrolled oscillation, try switching to a plastic trim ring. If the problem goes away, that was the reason.
9. Crowded electronics cavity: Having other effects inside the electronics cavity exposes the guitar signal to more electric crosstalk from the Sustainiac circuit board and signal wires.
10. Concealing the driver: If you cover up the driver (to fool people), you move the driver farther away from the strings by the thickness of the cover. This reduces the sustainer performance. Paint should work OK. Using a metal cover is even worse, and upsets the magnetic balance of the driver.
11. ES335 etc. are very difficult since there is no cavity access.
12. Placing a single-coil pickup next to the driver: This does not work well. The Sustainiac works fine, but the side-by-side permanent magnetic fields of our patented bilateral driver "bend" the field of a single coil pickup. The result is that the sound of three of the strings will have about 6dB lower output level than the other three strings. Same for a humbucker with "stacked" coils. A mini-humbucker with conventional "side-by-side" coils pickup doesn't exhibit this problem as much. In our opinion (and that of most customers), the Sustainiac driver sounds better than most mini-humbuckers. It also has the new dual-sound feature.

DRY-RUN INSTALLATION You can do a "quickie" installation on any questionable guitar to determine its suitability. Click here for a PDF file of the whole procedure:"DRY RUN" TEMPORARY INSTALLATION It adds about 10 minutes to the install time, but saves lots of time if it doesn't work out. Basically, you install the driver, and then connect the bridge pickup to the sustainer input. Connect a battery and a few other Sustainiac wires to ground. Leave the Sustainiac wires long, with the board hanging out the back of the guitar, keeping separate the sustainer output wires from the guitar signal wires. Connect a guitar amp. This will instantly tell you if this guitar will be suitable. We do this on many "strange" guitars to save headache/heartbreak.

Many more details are given on the INSTALLATION PAGE, along with hookup drawing of the most popular guitar types.

HAVING MANIAC MUSIC INC. DO THE INSTALLATION INTO YOUR GUITAR:

As an option, Maniac Music will install the system into your guitar for approximately $125- $175, depending on the guitar type. We charge extra for routing. For instance, if you want us to install the optional battery case, we charge $25 to route the cavity.

PRICING for different guitar types:

• The easiest installation is into guitars with electronics cavities that open from the back, and are roomy. This includes most "shredder" type guitars with H-S-S pickup configuration, and many 2-HB guitars. Gibson Les Pauls are not so roomy but do-able. Generally, these are $125 unless unusual problems are encountered.
• Next in difficulty is any pickguard guitar, such as Stratocaster and Ibanez Jem. We charge $150.00 for these. The problem here is that you have to remove the pickguard to do any adjustment, then fit everything back together again. It can involve multiple disassemblies/assemblies before everything is working smoothly. Also, we have to remove all the shielding foil from around the pickup area. A labor-intensive process. NOTE: Newer Jem guitars use a new VLX-91 switch that is wider than the old VLX91. This new wider VLX 91 takes up so much room inside the tiny Jem cavity that the Sustainiac circuit board will not fit into the cavity. Therefore, we have to create a new cavity under the pickguard for the Sustainiac board. Add $25 if this is the case.
• The Parker Fly (original version with large Fishman board and "octopus" ribbon cables) is $175. The new point-to-point version is a little easier, $150. More details are given on the INSTALLATION page.

  Shipping your guitar to Maniac Music: Click here for PDF instructions Shipping guitars.

COMPATIBILITY WITH ACTIVE PICKUPS, such as EMG etc.
The Stealth PRO kit is compatible with active pickups such as the EMG. etc. The EMG supplies a perfectly good input signal to the Sustainiac. (But its polarity is reversed from most other pickups, so to compensate for this you have to remember to reverse the red/black Sustainiac driver wires.) Be sure to specify on the Order Form that you are running EMG's etc. by clicking on the appropriate button. This is because the output impedance of the pickup amplifier is a little different than for normal magnetic pickps because many people use a 25K ohm volume control with EMG's.
NOTE ABOUT USING ACTIVE PICKUPS: You must use two separate 9-volt batteries, one for the active PU, the other for the Sustainiac. Otherwise, oscillation can result. Also, since sustainers use up batteries much faster than preamps, when the sustainer battery dies everything will stop working. You might be able to finish a gig with no sustainer, but you will need your pickups! When you have two batteries, you must replace your output jack with a special 9-pin TRS jack.. Click on the PDF file which shows how the jack is used, and why, and how it is hooked up. This 9-pin jack has built-in switches that disconnect both batteries indepently when you remove your guitar plug. Be sure to check this on your order form if you use active pickups.

COMPATIBILITY WITH PIEZO-ELECTRIC PICKUPS You can operate the Sustainiac if you select your piezo as the guitar output. Piezo pickups, on the other hand, don't provide a good input signal for the sustainer. Piezos and digital modelled pickups, etc. produce phase shift in the signal which alters the performance of electromagnetic sustainers. So, you must add a conventional MAGNETIC PICKUP INPUT as a bridge pickup for the guitar, to provide a suitable input signal for the sustainer. But, you can use piezos while the Sustainiac is on, and they don't interfere with each other. Same thing for guitars having hexaphonic pickups such as the Roland GK-2a for synths etc. See the next topic for details on this.

COMPATIBILITY WITH GK-2, GK-3 and other SYNTH PICKUPS Guitars having these special, hexaphonic magnetic pickups located next to the bridge provide a specialized low-output signal for driving hexaphonic synth systems and also the Roland "VG" systems. The outputs of the synth/VG systems generally do not have a suitable phase response for electromagnetic type sustainers such as the Stealth PRO. As for piezo pickups, you must add a conventional MAGNETIC PICKUP INPUT as a bridge pickup for the guitar, to provide a suitable input signal for the sustainer. You can use piezos while the Sustainiac is on, and they don't interfere with each other.

Stealth PRO for bass guitar: We have a special version of the Stealth PRO circuit board that allows strong sustain down to the very lowest notes. No extra charge. Just specify on the Order Form that you want it for bass guitar.

Bass guitar recommendations:The main thing is for the bridge pickup to be a "non-offset" type. Typical Jazz bass "J-type" pickups are straight, and work fine. The "P-type" has two coils that are offset. This design upsets the magnetic balance between driver and bridge pickup, which is necessary for proper sustainer operation. Therefore, the P-type pickup is not recommended.

SEMI-INSTALL OPTION FOR STRATOCASTERS ®

Special Strat option for Stealth PRO: We supply a pre-wired option for $75 extra. This option is available for 3-pickup Strats (and copies) only. All controls plus a "CRL"-type 5-position pickup selector switch and volume control come as a completely wired assembly. All you have to do is remove your existing Strat controls from the pickguard and bolt ours in their place. Remove your neck pickup, and put the driver in its place. Also, you have to replace your mono output jack with our stereo jack, and mount the battery either using the optional battery box ($16, routing required) or in the tremolo spring cavity (optional quick-change cover recommended, $16). This cuts the installation time from 3-5 hours to about one hour.

The master volume control is a CTS pot. The push-pull Harmonic mode control goes into the middle hole. The ON/OFF/Master tone control is at the bottom.

HEXAPHONIC MODEL We do not currently make a hexaphonic sustainer. These have six (or 7 etc.) independent sustainers. They allow complete sustain of chords. There are no immediate plans to make one. Occasionally, we get such a request but not very often. The size and complexity of such a sustainer would make the "STEALTHY" concept obsolete. Retrofit of such a sustainer would be a major project. The expense would be quite high. Furthermore, for most soloing, there would not be a great advantage. We may eventually do this, but not in the near future unless the request rate increases.