EDIT: The title of this thread has changed a few times as we went from: 1) Seeking input on envelope filters 2) Creating master synth architecture and seeking input 3) Creating an octave pedal and an envelope pedal with the same underlying synth program. 4) Added the Vendor tag Feb 2019: 5) We are now doing 2 pedals: Spectrum (envelope filter) and C4 Synth (modular synth in a small pedal) July 2019 Edit: The C4 is now released. The Spectrum comes out next month. Yes, one day we are going to be doing more of these. No firm plans yet, but we were debating some things at lunch today, so I thought I would check in the REAL experts. 1) How valuable are those indicator lights that give a sense of the peak level of the incoming signal? 2) How valuable is an LFO with various waveshapes? We have had these things on many filter product before, but we always wonder if anyone actually uses them for more than just curiosity.