ATTiny85 Midi controlled synth

The last time I tried to program the ATTiny85  to be controlled by midi, I did not have a lot of luck.  First thing is that apparently you need to have a bit of precision on you clock.  Internal clock speeds for these chips have low precision.

Also, midi is a standard…but a loose one at best it seems.  There are lots of ways to send the same note. The midi controller I had did not send things like I expected it to. And yet it was compliant to the spec. Still, this is hopeful.

https://mitxela.com/projects/midi_on_the_attiny