Some time ago I wrote a program for PowerSDR CAT to automatically set AGC-T just above the noise floor. In PowerSDR the AGC-T value seemed to be related to dBm. For example if noise floor = -106 dBm, I would set AGC-T to 96 (i.e. = abs(-106) - 10). Where 10 dB above the noise floor (adjustable) gives some quieting but you can still hear the weak signals.
Right now in SmartSDR, slider adjustable values are standardized to 0-100. Would it be possible to add a Slices.AGCThresholdDB property to FlexLib, i.e. set and get dB values related to signal level in dBm ?
Setting AGC-T to the correct value, quieting noise, really enhances copy of signals right around the noise floor. AGC Threshold is much better, in this regard, than AGC Gain in other radios.