MATRIXSYNTH: Low Frequency Expander using MPE to control OB-6 Part 3: pitch, velocity and aftertouch

Wednesday, April 07, 2021

Low Frequency Expander using MPE to control OB-6 Part 3: pitch, velocity and aftertouch


video by Steve Hunt

"The Yorick Tech Low Frequency Expander is being used here with MPE (Midi Polyphonic Expression) to control the aftertouch section of the synth, then the pitch bend and then the filter cutoff. MPE allows each of the synth's 6 voices to have its aftertouch, pitch and filter cutoff (or PWM) controlled independently, i.e. POLYPHONICALLY!

The OB6 can assign aftertouch (coming from the LFE via MPE) to the pitch of its VCO(s), loudness, LFO depth, filter cutoff or filter mode. In the first demo here, it is controlling VCO1's frequency, and as the VCOs are synced to VCO2, this gives the characteristic sync sound. The LFE is also multiplying each of its 6 envelopes by velocity, so each voice gets a different amount of sync envelope depending on each note's velocity.

The second part of this demo uses MPE to control the pitch bend of each of the synth's 6 voices. I'm using it here with 6 LFOs to generate vibrato, again multiplied by polyphonic velocity to give vibrato with each note having slightly different vibrato rates and depths controlled by its velocity.

The third part of the demo uses the MPE 'Y-channel' which the synth can assign to filter cutoff or PWM. Here it is being used to control filter cutoff, again with velocity affecting each of the LFE's 6 sawtooth LFOs so that each note can have different LFO depth.

This will all do the same with a Prophet 6.

This is an excerpt of a song of mine called 'Did we do the right thing?'

There's still a lot of work for me to do to be able to release this to LFE customers so this is just a taster of things to come for the LFE!"

See the Yorick Tech label below for more.

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