CV, V/octave , Gate/Trig inputs and outputs ?

[Aggebitter]

It would be nice to have a framework for analog inputs. I know a lot of people are into MIDI but as a modular synth nerd I would love to see that kind of framework included. Then we could in a defined manner control filters, pitch, delay/reverb. trig sampes, notes, ADSR and so on.
In combination with outputs we could "sync" the device with other modular devices from VCO to filters. We could create a MIDI to CV, V/octave Gate/trig converter. A tracker sequencer for modular synths.

Inputs:
The hard part in the analog domain is to get a good V/octave resolution and mapping both as input and as output. But that is hardware design and there is a lot of good designs open sourced.
Basic CV input is just a matter of resolution. CC messages are 0-128 and any 12-bit ADC would give a higher resolution than MIDI.

Gate and trigger inputs is just about voltage limit and common done with an OP amp. If gate or trigger could be defined in software by define falling edge = gate on, raising edge = gate off. The trigger is handled by falling edge and a reset timer.

Outputs:
CV range is a bit floating on standards but common usage is -5V to +5V, 0-10V and 0-5V and the output must be DC coupled as we are outputting a voltage and not a sound.
V/octave needs to be at least 14-bit to match 12 tones/octave without missing the 3-cent mark on pitch and have 8 octaves. But redusing the octaves.
Gate and triggers is easiest done by shift registers on the SPI bus. Fast and do not use up all GPIO's.

What do you think ?

// Agge