Ableton CV from track amplitude? Control another track's dry / wet?

Question

Rather than a gate's simple pass / nopass, is there a way to monitor the amplitude of a track, and apply that amplitude to another track's amplitude or dry / wet?

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An audio stream (track) is split into 2 rack chains:

1. original audio
2. muted copy with frequency band isolated

The muted copy has a gate (#1), which opens when the isolated band passes the threshold

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A completely separate track has it's own gate (#2) that monitors (#1), and allows it's own instrument to passthrough based on (#1)'s bandpass threshold

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Where gate is 0/1, is there any sort of 0-127 range send? How would you control a knob from this CV?

Answer 1

What you are looking for is a side chain setup: The gate (or downward expander) is on one track, but it "listens" to key input for the theshold from another track.

Take a look at this video:

Answer 2

If Max for live is an option:

The Max For Live Envelope Follower may suit your purposes if you wish to track audio amplitude for CV another controller.

Envelope Follower: a Max for Live device that tracks the changes in volume of an incoming audio signal and uses this information to modulate a mapped parameter.

Alternately a suitably configured CV4Live can also be convinced to do some level of audio frequency tracking back into controller data. http://skinnerbox.de/cv4live.html

I kept a simple single fixed rate sine oscillator handy and used that to set the top and bottom of the CVcontrol frequency expectations. Subsequently reassigning the input if the same control to something of interest afterwards. Combined with the amplitude tracking of 'Envelope Follower' it covered many cases.