I’m intrigued to hear that LPC playback is available in the new Plaits module. Can’t wait to play with that, when mine arrives
In the meantime, I’ve started tieing up some loose ends with my LPC object set for Axoloti, with a view to eventually releasing them quite soon.
One of the things I never properly worked out how to do, but that seems to be a prominent part of other musical LPC implementations is formant-shifting, specifically formant-shifting without also shifting the pitch of the voiced source/carrier wave.
I’ve found it’s possible to change the pitch of the whole synthesis system by altering the sample-rate the 10-pole filter runs at, but since it runs natively at 8kHz, I only have 6 multiples of the fixed 48k sample-rate of the Axoloti going up, and of course, sub-dividing the already very low 8kHz, things quickly turns to mush.
Any advice from someone who knows more about DSP than I do would be greatly appreciated.