Known controls are:
jack.jack1c.mute ON|OFF (currently OFF)
jack.jack1c.pcm11 [<leftvol>:<rightvol>] (currently 50.9:50.9 dB)
jack.jack1c.pcm12 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1c.pcm3 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1c.pcm2 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1c.jack6 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1c.jack5 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1c.pcm4 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
jack.jack1d.mute ON|OFF (currently OFF)
jack.jack1e.mute ON|OFF (currently OFF)
record.select1.select1 <pcm3|pcm2|jack6|jack5|mix> (currently pcm3)
record.select1 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
record.jack6 [<leftvol>:<rightvol>] (currently 38.9:38.9 dB)
misc.pcm2 [<leftvol>:<rightvol>] (currently 50.9:50.9 dB)
misc.mute1 ON|OFF (currently OFF)
misc.pcm3 [<leftvol>:<rightvol>] (currently 50.9:50.9 dB)
misc.pcm4 [<leftvol>:<rightvol>] (currently 50.9:50.9 dB)
misc.mute2 ON|OFF (currently OFF)
misc.mute3 ON|OFF (currently OFF)
vmix0-enable ON|OFF (currently ON)
vmix0-rate <decimal value> (currently 48000) (Read-only)
vmix0-channels <Stereo|Multich> (currently Stereo)
vmix0-src <Fast|High|OFF> (currently Fast)
vmix0-outvol <monovol> (currently 25.0 dB)
vmix0-invol <monovol> (currently 25.0 dB)
vmix0.pcm7 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm8 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm9 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
vmix0.pcm10 [<leftvol>:<rightvol>] (currently 25.0:25.0 dB)
That was output of ossmix , Is any sound increase possible ? I have turned the knob on my speaker to extreme , already .