Multiplier Module
The multiplier module multiplies a signal (red terminal) with a second signal, to which
a bias offset and scaling is applied. This is cool for if you want to talk a drumbeat into
the mike. Hard to explain - try it!
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Bias is an added amount added to the second (modulating) signal which causes the original
signal to come through with zero modulating signal.
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Scale is basically like a volume for the multiplier module.