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Rhythmic Inversion: patching challenge
MUFF WIGGLER Forum Index -> Modular Synth General Discussion  
Author Rhythmic Inversion: patching challenge
hey everyone,

i posted a long while ago about trying to invert a gate sequence with rene- inverting, not in the sense of inverting the voltage but rather the rhythm. it is a technique that is common in african and other rhythmic-centric musics. let me explain:
lets say x marks a 16th note on and 0 marks a 16th note off:


when inverted this should be transformed to


after trying and failing with rene, i realized i might need some more flexible tools, so i resorted to the doepfer logic a-166 and the sequential switch a-151. However, even with these tools im still left scratching my head. hmmm..... Some modules i have which i might be able to use for the task: sport modulator, maths, qcd, and the doepfer modules i mentioned.

would be very curious to see if anyone has a patching technique for this.


This should be trivial with any module that can add a constant dc offset to an input and invert the input. Many utility modules do that. I think you can do this in maths using the middle channels, one being the positive dc offset, the other taking the gate signal and turning the attenuverter knob fully ccw.
Just inverting the voltage like that will only work if the rhythm is legato (each pulse fills all of its time slot, no gaps between pulses when there are two in a row). But if you invert like that and then AND the result with a second rhythm that has a gate pulse on every beat, it should work. There will be small glitches if your gate pulses are not all the same length, which you can filter out by putting it through a slew rate limiter and possibly also a comparator.
Should be easy enough to do by patching some logic.
When I get a chance I'll give it a shot. w00t
Ok! Got it! hyper
Sorry I took so long, I also had to take a dump... hihi

By patching the pattern you described into a logic module, and patching in a pattern with all the grid spaces filled with Xs, and using an XOR output, you'll get the inverted pattern.
But, you've got to make sure the your trigger/gate lengths are the same for each input or you may lose or gain extra triggers. w00t

w00t _ w00t w00t _ w00t _ _
Would a "Not" work? There is one on the RYO Logic modules
Had similar going on with Pam's, PEG and Doepfer logic (and forgive me, this is from memory)...

Pam's clocks both channels of PEG and sends a Euclidean pattern to the Quant input of one channel. One of the gates from this channel (can't remember which) goes into the Doepfer. The And output goes to the Doepfer's inverter and into PEG's second channel Quant. Because PEG is responding to the clock as well as the gate from the inverter you get on-the-beat envelopes.

Note - Could have gone straight to the inverter, but I wanted to leave myself the option of extra funky.

Edit: A better way would have been to mult the Euclidean sequence to the Doepfer, rather than take a gate from PEG. But the important part is clocking PEG so you get regular envelopes rather than a flat gate signal.
sounds like a job for teletype
I've done something like this with SQ-1 a comparator and vca. I create a pattern with all steps filled and use the pitch knob to select whether I want a particular step to go to drum voice A or B. If the pitch is set high it triggers the comparator which opens a VCA letting the gates through.
A-165 does exactly that.

As long as you send it a gate that takes up the whole step (in your case a 16th note) it will be inverted in the way you describe. Gate OFF will become ON and vice-versa.
XOR with one input being the sequencer/clock divider's gates and the other being the sequencer/div's clock input.
Make sure gates retrigger at end of clock cycle.
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