weuw wrote: 
> Hello
> And thanks for C3PO Plugin !
> I've noticed something strange on my system : when I check C3PO flip
> channels, the sound seems louder and even better than without checking
> it...!
> What does it do exactly ?
> Thanks
> Serge
You could check the RESULTING COMMANDS section of C-3PO player settings
to see what the actual command looks like in your system, in mine, where
I have a reduction in the RIGHT channel, this is the resulting command
for flac:

  flc pcm * 00:e0:4c:68:ce:77
  # F noArgs, R noArgs, I noArgs, D RESAMPLE=-r %d
  [flac] -dcs --totally-silent $START$ $END$ -- $FILE$ | [sox] -q -t wav - -t 
wav -b 24 --buffer 32768 --multi-threaded - gain -h remix -m 1v0.91 2 rate -v 
-M -b 95 48000 dither -f improved-e-weighted
  that becomes:
  flc pcm * 00:e0:4c:68:ce:77
  # D RESAMPLE=-r %d, I noArgs, R noArgs, F noArgs
  [flac] -dcs --totally-silent $START$ $END$ -- $FILE$ | [sox] -q -t wav - -t 
wav -b 24 --buffer 32768 --multi-threaded - gain -h remix -m 2v0.91 1 rate -v 
-M -b 95 48000 dither -f improved-e-weighted

As you could see, the only difference is -m, wher channels are inverted
(first is out Left, second is Right, 1 is input left, 2 input right,
v0.91 stand for volume 91% of the input channel).

Depending on other settings adding "remix -m" or, in general, gain/
volume alteration could result in SOX claiming back the headroom in
excess, resulting in a sound louder, gain -h (option automatic headroom)
is there to avoid clippings.

BTW, the SOX volume control is considered one of the best out there but
be sure dither is applied when needed.

Author of C-3PO plugin,  Squeezelite-R2, Falcon Web interface - See
marcoc1712's Profile: http://forums.slimdevices.com/member.php?userid=34842
View this thread: http://forums.slimdevices.com/showthread.php?t=105309

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