Hello friends, I am new in this forum and I am right of I found the ideal place to obtain help, I notice that aquà has people very understood in the subject. I am building an alaog monophonic synth with 37 keys, MIDI Keyboard with Velocity sensing with a total of: 30 potentiometers 13 SPDT on/off/on toggle swithces 7 rotary switches 1pole 6 positions 2 rotary switches 1pole 4 positions (See circuit in included PDF) I can implement my synth with a sytema MIDI and with presets memory using a MIDIbox. I need to know which MIDIbox is more appropriate to my project, MIDIbox CV or MIDIbox64. Thanks See my diagram in block below MIDI Analog Synth.pdf