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Each victor has it's own power and is like a volume knob controlled via the PWM's signal.
When you want a stereo louder, you turn the knob to a certain number higher than current state, 0 - 10. 0 volume being off, 10 volume being loudest possible.
For quieter, you turn the number lower than current state.
The PWM/Vicotor combination work the same way. The position of the "volume knob" is determined by the signal percentage. (See the image attached in Jnadke's post)
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