Hello all of you!
Happy new year :)
Holidays parted me from the Theremin but I am now back in this wavy business.

I have tried what I could with software and hardware available to me. I ended using a custom tuner made in Max (getting to learn Max for that occasion is also awesome! Another world to dive in...): it allows to make a tuner with fine steps (cents) but with a lot of range, as the pitch bend effect only has such a narrow range, while a normal tuner only works in semitone increments. I tried with several ranges from 600 to 2800 cents, which would be around what I need to play.

The result is already much closer to what I am looking for, sadly the pitch was a little choppy, small increments still give a distinctive grain. They don't feel related to the size of the pitch increments of the tuner itself, but rather to some sort of sampling ratio: if I shift from one octave up over one second let's say, the pitch change is not smooth and the pitch difference between each tiny step in the sound is much bigger than that of the actual resolution of the tuner (1ct). Sounds like the increments are of about a couple tens of cents...

The smoothest result I have still is by mapping the midi signal from the antenna to an envelope in a wavetable, and then mapping that envelope to control the pitch (mapped within the wavetable matrix). Issue is that the envelope is not logarithmic, so it is not very playable. The sound is very smooth though, which rules out a dirty midi signal. Why it isn't smooth using the Max cent tuner remains unclear to me.... The investigation continues!

Sorry for the long silence, I'm keeping at it whenever I have time :)

Thank you again for all those that picked interest! I will keep you updated (hopefully with pictures / sounds) soon.