https://www.kickstarter.com/projects/electro-smith/daisy-an-... is worth a look as well. They have dev platforms in Eurorack, desktop synth, and guitar pedal form factors that could be used for something like this, though they have enough DSP to actually run the audio processing the module, but it seems like it could be used for something like a hybrid setup as well with VCV rack with some software work.