I created a mini Eurorack modular synth set for EWIs. I used two midi-to cv converters , which convert all midi info from EWIs such as note, breath/after touch, modulation, portamento into controlled voltage(CV), I added 3 sound modules, mixer/filter module, LFO module. The audio output goes to iPAD via the audio interface. on iPAD, Moog moogerfooger effect plug-ins are installed , improve the audio from this mini Eurorack . It sounds wonderful with great & smooth expression.