The couple "rms / gain" could be the solution for a control level,
but I would have to abide by certain conditions before putting into action the patch, the list:

- When the signal_1 will stand at = 0 / or near-zero / the patch will not be actuated;
- I think the patch should work on time periods of some length and not sample to sample;
- When the condition is satisfied, and the patch will come into action, the latter will have to apply a gain difference (k) between signal_1 and signal_2, difference that you could change to speed "k" also from gui (for example) in time real.

e

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