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Advanced Manual for Polybass-R

(RMC/Godin Multiac version)

V5 15.4.2020

Why do we make such an effort?

Bass is fundamental

working as a sound engineer, playing in bands, studying the history of instrument making
and analog electronics, the feeling became stronger every year that bass is much more
important than it seems. it's unfair that the bass player is in the background, but it also fits
to his fundamental task of stability and coordination for all other musicians.
Harmonies are built from harmonics of the fundamental tone. on primitive instruments like
the fanfare its only possible to play those notes, and hearing the bass tone, we feel why
all other notes belong together and why the notes that are not directly in the scale create
an interesting tension...
more so, I feel that the vibrations resonate in our bodies and a concert or dance night is
not just a social and cultural event but also a therapy... short:
IF I COME HOME FROM A SHOW AND DID NOT FEEL SOME LOW BASS, I AM NOT SATISIFIED !!

How to create the bass in a small ensemble

unfortunately not in every combo there is space for a bass player. there are probably more
duos and trios of voice, guitar and percussion or harmonica and clarinet and so on where
one of those instruments takes the musical task of the bass player, yet on an instrument
which does not have the size to create a real low bass.
BUT:
we are lucky that engineers of the last decades created portable woofers that fill a big
room with solid and profound bass! so one of the band can play a bass pedal and its done.
how clumsy and synthetic! we have a better solution: we divide the lowest notes of the
guitar so that they turn into bass notes! the guitar plays as usual, maybe a bit more aware
of its function, and the bass comes out for free, low and alive, discrete and present, but
not calling attention or pretending to be another instrument: everyone can see who plays
those notes, no one cares why they sound so low, but they feel satisfied

The physics of intervals

since the scales are made of harmonics which are multiples of the bass note, the higher
climb in the scale, the more notes we get, the closer the intervals are. and also: the high-
er the frequency, the shorter the wave, the quicker we identify notes. so an interval that
sounds good on the guitar can sound wobbly one octave lower!

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Summary of Contents for paradis Polybass-R

  • Page 1: Advanced Manual For Polybass-R

    Advanced Manual for Polybass-R (RMC/Godin Multiac version) V5 15.4.2020 Why do we make such an effort? Bass is fundamental working as a sound engineer, playing in bands, studying the history of instrument making and analog electronics, the feeling became stronger every year that bass is much more important than it seems.
  • Page 2: What Is Different About Polybass

    What is different about Polybass there have been many approaches to create bass, but not for a clean single bass line! ba- sically, one octave generator which switches to the lowest played string would be enough. but we found that sudden switching between strings call attention. so we made an octave generator for each string, tune it to the string and then select the lowest note and fade the previous.
  • Page 3: Table Of Contents

    Contents Advanced Manual for Polybass-R Understanding and Adjustments Priority (RMC/Godin Multiac version) Battery low warning Power consumption Why do we make such an effort? Li battery Bass is fundamental solder battery wires How to create the bass in a small ensemble...
  • Page 4: Installation Into Godin Multiac Sa/Acs

    14pin flat cable connector from it plug the 14pin flat cable into the same position on the new Paradis board (its possible to connect off by one pin!) position the board by the screw holes and then gently press it down in the correct...
  • Page 5: Installation Into Godin Spectrum / Jazz

    2,5mm. since this puts the two boards out of alignment, we extended the two left-hand screw holes in the Paradis board so that it can be secured in place. the other two screws can be left off, or if you feel that they are necessary, you can easily cut the bit between the edge of the board and the holes.
  • Page 6: Installation Into Rmc Polydrive

    Installation into RMC Polydrive basically the installation is the same as into the Godin Multiac SA/ACS. we do not provide the fixation of the battery holder like the original. but we can send you a battery holder which you can connect to the solderless posts and tape to the Polybass board.
  • Page 7: Rmc Compensation Filter

    RMC compensation filter the RMC Polydrive preamps have two fixed filters layouted next to the tone control, but usually only one is populated. we try to explain this here but you do not need to study it: warmer sound independent of all the explanation below, if ever you find your sound too sharp, remove the jumper Treble Boost to experience a warmer sound - freely choose what you like better.
  • Page 8: Remove The Rmc Filters

    remove the RMC filters you can achieve a really flat sound by a simple mod to cut the original filter on the RMC slider board. for this, both boards need to be removed and you can see which version you have: treble filter on and the bass filter off treble filter off and the bass filter on...
  • Page 9: Understanding And Adjustments

    Understanding and Adjustments Priority probably the most unique part of the Polybass is the priority function: only the lowest played string is audible and switches the higher ones off. its useful enough that we make it active all the time. the priority idea comes from the physical fact that we easily hear small intervals in the higher octaves but perceive the same interval as rumbling or wobbly when its in the lowest octave.
  • Page 10: Adjustable Volume For Each String

    Adjustable volume for each string the RMC pickup is amazingly balanced, other pickups need correction. it can be helpful to adapt the string volumes to playing style, to string characteristics, to musical intentions… from outside with a little screwdriver, boosting the weak strings… D4 string Bass volume by default, the Polybass effect on the D4 string is similar to the E6 and A5 string.
  • Page 11: Roland Guitarsynth And Compatible

    Roland GuitarSynth and compatible in case you are using the Roland GK synth volume as it was intended originally, you will probably notice that it does not work any more because it now controls the Polybass. (on boards with serial < PB-R-0068 it controls Synth+Polybass so you may go to step 2) if this does not suit you or the synth stops to sound (likely with GR55) try this: set the jumper VolGK (not available on boards with serial <...
  • Page 12: Insert Connector For Woodi-M Etc

    7V. you can connect a LED to X11 pin5(+) and pin6(-). since this LED is not lit during ordinary operation, in the Paradis guitars we use a common anode two color LED and connect the red part as mentioned above and the green wire goes through a >10kOhm resistor to ground, so its constantly lit (dim, to not spend battery).
  • Page 13: Split Polybass Effect Out

    Split Polybass effect out sometimes its interesting to amplify the Polybass effect signal (we call it simply PBass in this manual) separately from the normal guitar signal because: • some guitar effects (especially distortion) suffer when the PBass is mixed in. •...
  • Page 14: Connector Options For Split Outputs

    Connector options for split outputs you have those main options for separate outputs (we call the sub octave signal Pbass): main jack+DIN13pin7 = Pbass only / guitar from single string outputs. the easiest case since it does not need new wiring, you just need to take away the guitar signal from the main output.
  • Page 15: Volume Control For The Split Pbass

    volume control for the split PBass options to control the volume of the PBass before its sent to its own output: 1. a 20k log in the output line: 2. a VCA control which replaces the GKVol. somehow simpler, but reduces the out- its provided on X14: put impedance in case of not being fully open...
  • Page 16: Polybass Connection Schema

    Polybass connection Schema...
  • Page 17: Polybass Layout

    Polybass Layout...

Table of Contents