Arduino synth - midi input + LFO with analog controls

Wired a Midi input in to the Arduino synth I'm playing with. The base note is summed with the LFO (would be better to sum from the LFO midpoint, but this is just a test)

This seems to make the Arduino quite unstable - I found it best to disconnect the MIDI RX pin when uploading code to the board.

It's a bit noisy but when I rewired it afterwards it sounded clean; I think the wiring on the output was a bit sketchy - it's just held together with croc clips.