Hello, I bought a (maybe too cheap) AY-3-8910 chip from ebay (microchip version) and hooked it up to an arduino like you described. And compiled your serial mym tool. (all compiled and runs perfectly). but the result sound is bad.
I only hooked up one channel to a little speaker with 1K resistor to ground, to check it.
Do you recognise this bad sound? did I do something wrong? or is it a bad chip?