Public bug reported:

Binary package hint: rhythmbox

On Karmic:

When rhythmbox changes track, its internal volume level changes, rapidly
heading towards zero. I start with a comfortable volume level in
rhythmbox of 10%.  After one track, it changes to 1%, and then after
another track it's at 0%.  It doesn't happen absolutely every time, but
pretty close.  I have the gconf key /apps/rhythmbox/use_replaygain set
to false, which may make a difference (rhythmbox was hanging frequently
when I had it on)

Its internal volume level scale seems weird too: changing it also
affects the application volume in pulseaudio, but not in any way I would
expect:

Adjusting the volume in Rhythmbox goes as follows:
Rhythmbox volumes (percentages)
muted, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 
40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 
80, 82, 84, 86, 88, 90, 92, 94, 96, 98, Full volume
corresponding to Pulseaudio volumes (percentages)
0, 62, 69, 73, 76, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 88, 89, 90, 90, 91, 
91, 92, 92, 93, 93, 93, 94, 94, 94, 95, 95, 95, 96, 96, 96, 97, 97, 97, 97, 98, 
98, 98, 98, 99, 99, 99, 99, 99, 100, 100, 100
and alsamixer Master volume levels (percentages)
0, 29, 42, 48, 55, 58, 61, 65, 68, 71, 71, 74, 74, 77, 77, 81, 81, 81, 84, 84, 
84, 84, 87, 87, 87, 87, 87, 90, 90, 90, 90, 90, 94, 94, 94, 94, 94, 94, 97, 97, 
97, 97, 97, 97, 97, 100, 100, 100, 100, 100, 100, 100, 100.

Adjusting the application volume in pavucontrol gives the following:
50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100
corresponds to Rythmbox internal volume
1...1
and alsamixer master volume
3, 13, 26, 32, 42, 52, 61, 71, 81, 90, 100

** Affects: rhythmbox (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Binary package hint: rhythmbox
  
  On Karmic:
  
  When rhythmbox changes track, its internal volume level changes, rapidly
  heading towards zero. I start with a comfortable volume level in
  rhythmbox of 10%.  After one track, it changes to 1%, and then after
  another track it's at 0%.  It doesn't happen absolutely every time, but
  pretty close.  I have the gconf key /apps/rhythmbox/use_replaygain set
  to false, which may make a difference (rhythmbox was hanging frequently
  when I had it on)
  
  Its internal volume level scale seems weird too: changing it also
  affects the application volume in pulseaudio, but not in any way I would
  expect:
  
  Adjusting the volume in Rhythmbox goes as follows:
  Rhythmbox volumes (percentages)
  muted, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 
38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 
78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, Full volume
- correspond to Pulseaudio volumes (percentages)
+ corresponding to Pulseaudio volumes (percentages)
  0, 62, 69, 73, 76, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 88, 89, 90, 90, 
91, 91, 92, 92, 93, 93, 93, 94, 94, 94, 95, 95, 95, 96, 96, 96, 97, 97, 97, 97, 
98, 98, 98, 98, 99, 99, 99, 99, 99, 100, 100, 100
  and alsamixer Master volume levels (percentages)
  0, 29, 42, 48, 55, 58, 61, 65, 68, 71, 71, 74, 74, 77, 77, 81, 81, 81, 84, 
84, 84, 84, 87, 87, 87, 87, 87, 90, 90, 90, 90, 90, 94, 94, 94, 94, 94, 94, 97, 
97, 97, 97, 97, 97, 97, 100, 100, 100, 100, 100, 100, 100, 100.
  
  Adjusting the application volume in pavucontrol gives the following:
  50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100
  corresponds to Rythmbox internal volume
  1...1
  and alsamixer master volume
  3, 13, 26, 32, 42, 52, 61, 71, 81, 90, 100

-- 
rhythmbox internal volume level changes on track change, doesn't match 
pulseaudio level, scales weirdly
https://bugs.launchpad.net/bugs/405892
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