The current layout, as seen in INO file, where connections can be pasted back into https://www.pjrc.com/teensy/gui/ looks like this:
The Pure Data for my keyboard and controllers looks like this:
(this is just to prototype the UI until there's real knobs and keys - the PD sends MIDI that Teensy receives as usbMIDI).
Later I discovered "Ctrlr" which does the same but in a prettier way...
Having received a bargain Novation Remote from ebay (£32!!) then I used its editor to define this control layout that hopefully matches the Ctrlr layout above:
And this is a rough (very rough!) layout diagram to show how some of the bits connect together (I won't call it "schematic" as it doesn't deserve that title!):
Read the WIKI: https://github.com/wrightflyer/Synth/wiki for more details about the hardware and the software and just how it all came about!
This is the dataflow in the class based polyphonic phatBass:
