#17 Enable gain control

[David A. Gatwood]

Add gain control for mpg123 in real-time. The
controls work in X11, but are not attached to the
underlying sound system.

[David A. Gatwood]

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This supercedes 459072. The initial value will be
passed as a gain argument to the player, and the
player will pass this on to esound. Upon completion of
this implementation, these changes should be
submitted upstream.

[David A. Gatwood]

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Umm... this is a feature request, not incorrect
behaviour. Refilling correctly.

[David A. Gatwood]

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user_id=189212

Umm... this is a feature request, not incorrect
behaviour. Refilling correctly.

[David A. Gatwood]

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Priority to 8. Not show-stopper, but top priority after PB.

[David A. Gatwood]

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Lowering priority to 6. This is not in consideration for
PB. Currently, P9 is PB show-stoppers, P8 is PB high
priority, P7 is PB low priority, P6 and below are post-PB.
SourceForge really needs a much more rich
prioritization system. This number thing is just lousy.