No sound on first test [solved]

yes, weird. I can hear a very faint high pitched whistle at Osc - whether or not its the oscillator I can’t tell - I suppose I could play a few notes on the keyboard and see whether the pitch changes…

If you look in the schematics theres not much (aka nothing) between the OSC Pin on the Connector and the ATMega, so look there for bad solder joints.

Found it! and now it works perfectly. Thanks to you all for your help, and thanks especially to Olivier for designing such a fantastic synth

Could you please tell us what it was? It might be helpful to other people who encounter the same problem…

I re-soldered a few joints and it worked - poor spldering