Polybass can be built into any guitar with a polyhonic (hexaphonic, separate string) pickup
Out of the box, plug and play, it only works in guitars with RMC Polydrive system, mainly the Godin Multiac’s that provide a 13pin Roland compatible output: SA/ACS/Spectrum/Jazz (not Duo, not Encore).

7string guitars is not quite solved. to apply on the E/A/D string is easy but problably not what is needed. to add another octaver to process all 4 bass strings would be a giant redesign of a bigger board. with some soldering its possible to octave the lowest 3 strings B/E/A. if that satisfies you, please contact us.

yes, except that the GK Vol control (the lowest slider on the Multiac) also controls the Polybass. if this does not make sense to you, you can switch off the GK Vol control in your synth and control the Synth volume either on the synth itself or with some MIDI controller or with a Expression Pedal or on the mixer. if you feel bothered, there are other solutions to control the Polybass or leave it in a fixed level (ask us for the advanced instructions).

it works with either outputs! what many call the “MIDI guitar” connection is in fact a Roland 13pin DIN analog connection with all strings and some control and supply, so its not related to MIDI except that it allows to feed a Guitar2MIDI converter. the jack output and the pin7 of the 13pin output (intended for mono pickup) are tied together by RMC, so we add the PBass effect signal to both of them.

by default, the Polybass effect on the D4 string is similar to the E6 and A5 string. but some musicians like to have no effect on the D4 string and others prefer it to be lower so there is a transition between the strings with effect and the ones without.
try out your setting on the single little trimmer on top of the board!

every guitar has some resonances in the neck that „eat“ the energy of certain notes, so they fade away quicker than the others. usually the worst is around G…A. those irregularities are better audible with the Polybass, but not related to it. so sorry, we cannot fix this, nor your luthier, but you can improve a lot by holding the neck firmly when you play that note.

yes, it happens on some Multiacs, they are not all the same. but this can easily be fixed with a jumper:
most of the original RMC preamps have a treble enhancement on one board and a compensating treble cut on the other (probably to improve noise). since we only replace the board with the input stage, we had to add the same treble enhancement option. this compensation filter is switchable with a jumper which is set by default.
so if you plug the board as you receive it, and the sound is too dull, just remove the jumper!

Yes! but this needs more skill. solder another wire or add two pins to the 14pin connector and replace the flat cable by a 16pin (this is how we do in the Paradis guitars, its explained in the manual)

we used a solder free wire connector to make it as simple as possible for most of the users. so far they did not fail except in frew cases where someone did not understand and force the little lever which only needs to be pressed slightly while inserting the wire.
but if you travel around the world and need top reliability we recommend to solder those wires.

we have a circuit on board that flashes once at connecting the guitar and starts flashing constantly when the battery becomes low.
it can also be modified so that it is constantly on – consuming battery. (explained in the manual)
in general we recommend Li 9V batteries that are rechargeable so you can charge them before every show and never have a problem.
or you can feed the instrument through the 13pin connector and forget about the battery! (explained in the manual)

Yes! in the classic Polysubbass unit, there is a switch to turn priority off, so all played bass strings are octavated. few people have used this, but if you like this option, you can install a switch to Prio1 (A-string) and Prio2 (D-String).(explained in the manual)

NO!! you can use the Polybass with any polyphonic piezo pickup and some additional mono pickup of your choice by creating the correct cabling. it works on its own (no filter controls) and we provide output board, flat cable and potentiometers and connectors so you have many options to connect volume controls and send out signals… (there is a special manual for this installation)