A few months ago I was asked if WinBoard had an option to set up a different sound when a piece is captured.
To clarify, when paying against an engine or an ICS opponent, if your opponent captured one of your pieces, the user would hear a different sound, if desired, than the sound the user heard when the engine or ICS opponent made a non-capturing move.
I told him no, I didn't believe that was possible.
Now, I don't have a need for this myself, but apparently other interfaces have this option and some user's like it.
If so, a new setting in the ini file could be something like:
/SoundCapture
right next to /SoundMove.
If the user doesn't wish to hear a different sound, they would simply leave /SoundCapture blank (or specify the same sound as SoundMove).