What specifically are you trying to do? Change the volume in a pattern, or just make it louder / softer?
If it's the latter, changing the final 358 stage to include a variable resistor would be simplest.
What specifically are you trying to do? Change the volume in a pattern, or just make it louder / softer?
If it's the latter, changing the final 358 stage to include a variable resistor would be simplest.
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