If you want to use PWM for clean audio, I suggest you reprogram the registers to crank the PWM frequency up. It will make filtering ALOT easier while keeping the audio intact.
TCCR1B = TCCR1B & 0b11111000 | 2;[/quote]
Will bring the PWM frequency on pins 9 and 10 to about 3.9KHz.
I have an AC oscillator making the wave. Not using PWM frequency for the wave. Wanting to use PWM to affect the external sound circuit in two ways, maybe find a third.
It's like being able to control the slide of a trombone when something -else- vibrates the air.
I'm trying to control the slide with PWM, not vibrate the air, move the bow not be the string.
And I wonder how fast I'll be able to move the bow smoothly.