[Freeswitch-users] Detected energy & floor in mod_conference

With callers in a conference, if I do a 'conference list' on the fs_cli, I can see the members in a conference and who is talking, but the 'energy detected' field is always at 0, even though the minimum energy is set at 300 (changing the energy threshold doesn't seem to affect detected energy, it's always at 0). Is this something that has gone by the wayside, is slated for implementation later, or am I just reading the wiki wrong? Is it possible to detect the volume at which individual members are talking? Also, what is the significance of 'floor'? All I can find via google is some references to video conferences. Does this have any effect on audio-only conferencing? TIA, -Aaron