Modulate Ch. A in Amplitude AND Frequency with Ch. B

[Trebor]

I would like to cause an audio signal in channel A to be modulated in both amplitude and frequency (simultaneously) by a random waveform in channel B.

… Is it possible to create a script that will do this?

I know of Nyquist code which Amplitude Modulates one channel with another,
see … sound multiplication - #2 by steve

Frequency Modulation is also possible via Nyquist prompt …
Modulate one waveform/track with another (FM synthesis) - #2 by steve (NB: that’s old “legacy version” syntax).