Midi addon

[8bignic8]

I want to make a midi adapter.
If someone wants to colaburate, just texts add to this tread or text me.
Planned Features (will see what is possible):

• Pure clock signal input for sync with eurorack.
• Midi Input TRS (audio Jack Format) to play the synth with an external midi Keyboard. Like Midi Secs
• Midi notes play the Synth.
• Midi Notes change the parametes of the potentiometers.
• Midi clock signal syncs the whole speed (LFO....) notes pressed.
• (maybe) different notes trigger different sync parameters.
• (maybe) Midi Notes change more parameters in the synth.
• (maybe) changing midi channels on Hardware not just in IDE.

My questions are:

• Does anyone have a good Idea, which are the best pins to steal, for the input signal?
• Where should the clock be feed into?
• What should the Mapping be aka what kind of note on which Midi channel should trigger waht internal Function(filter, LFO, DSR)?

I´ll prepare now and keep posted here if something changes and it works :).