Drawing wavetables on touchscreen

A very cool feature of some iOS/Android apps like Caustic when using a wavetable osc is the capacity to just draw your own wavetable with the touchscreen (or edit a base sine, square etc).
Given the Zynthian has a touchscreen, I was wondering how hard it would be to implement this feature and use it to set on the fly the wavetable used by some LV2 plugin (supporting custom wavetable).
I don’t really know anything about LV2, so I don’t know if that’s about feasible.

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The big problem with wavetables is that they are hardly compatible with different machines… The (single) waves you @YPares mention on Caustic, there even is no “Save” option… So once you draw it on the Subsynth, you can’t use it on another machine…
The ones you create with your U-He Zebralette cannot nmbe exported in an universal format like wav or so…
Blofeld will only accept one kind of .wav format…
But yes, I agree with you @YPares, drawing a wave cycle on Caustic’s touch screen is a pleasant, easy and comfortable process… And shaping the harmonic spectrum on PADsynth, using the touchscreen, is also very userfriendly… (would be more tricky if it were more than 32 harmonics, I guess)…

If you want such a feature (and it sounds cool) then submit a feature request on GitHub. You will need to consider where such a feature might be used and give real-world examples, e.g. create and use wavetable in this synth engine and that synth engine.

So you mean the type of wav format is not standardized by LV2? Yeah, so I suspect some synths would expect headers vs. no headers or 48000Hz sample rate vs. 44100Hz, that sort of thing.
Although saving it as a wav/raw/pcm should not be too hard if we have a file describing which format is expected by which synth.

@riban Yep I’ll flesh that out as a proper feature request :slight_smile:

Side question: how does the OLED display derive the UI for a given synth? Does it just list all the params available in the LV2 description or do we have more control over that? (Like, could a specific synth have a custom display? I haven’t investigated MOD-UI)