The little 8 bit atmel attiny85 has a great fastpwm feature. It can get almost 20khz output,with 8 bit duty cycle control. This is plenty to make a multichannel

The little 8 bit atmel attiny85 has a great fastpwm feature. It can get almost 20khz output,with 8 bit duty cycle control. This is plenty to make a multichannel chip tune soft synth. Sounds good just hooking the pwm pin directly to an earbud.