Pat-The-Pirate:
Well, full marks to Sparx ( ! ) for getting me in possession of a working copy of the Littlebits / Drongowski MidiOrgan. I can now play 5 notes at a time i.e. a full chord on the piano, which is just magic.
The organ kept stalling so I started grubbling around looking for possible causes.
Well, I found that the code reads A0 but the project doesn't add any hardware to actually set A0. A0 is floating if you follow the project instructions. Not good practice.
If A0 is at zero volts, a Farfisa organ sound is selected. In theory, if you raise A0 above 2.5V, you get a Vox sound. However, there is no sound at A0 >= 2.5V because of some other perhaps code- or UNO-related problem. (The project is geared toward Leonardo).
This caused endless grief for me although I didn't realise it at the time: my unconnected A0 tended to fly above 2.5V when powering up the board, in addition to any static effects, so half the time I wasn't getting any sound, but not for reasons connected with the libraries etc.
Fixed in minutes with a 1K resistor and a SPST switch to 3.3V.
The other thing he doesn't say in the description is that it can only play 5 octaves, which is Ok once you know what's happening, but leads to paranioa if everything else has gone wrong in the meantime.
