I recently received this question from a SigmaDSP user:
I’ve been asked to provide some feed back functions related to a compressor. Assume the compressor is configured as a noise gate with the response curve 1:1 down to -40db at which point (the threshold) it drops vertically to make the gain -90. I’d like to have an indicator that says that the gate is suppressing the signal (signal is below threshold) or passing un-attenuated (signal is above threshold).
It does not appear that any of the compressors have an output like the limiter block that sets a flag.
So I have a couple of ideas: envelope peak detector + DSP read back, A>B cell plus a DC source set to the same threshold as the compressor.