The sound list that DS presents is generated from the sounds registered with Minecraft's Sound Manager. It is possible, however, for a mod to play sounds outside of the Minecraft sound engine, and DS would not be aware of it. Do you know what sound is playing?
BTW, if you enable DS debug logging and hit F3 while in game to the lower left you will see a list of OGG files that are currently queued in underlying sound library. The names may give you a hint as to where to find the actual high level SoundEvent.
BTW, if you enable DS debug logging and hit F3 while in game to the lower left you will see a list of OGG files that are currently queued in underlying sound library. The names may give you a hint as to where to find the actual high level SoundEvent.