What about the callback? Where does this come into it?
All you have to do to make it re-use a channel for the same sound is pass the channel handle back into playsound and use FMOD_CHANNEL_REUSE.

That, or simply call channel->stop() then System::play and get the new channel handle, i don’t see what problem your having.

See reply to link in this thread, you’re going to have to repro this because all tests I do are contrary to what you are saying. It can’t have suddenly stopped working because that stuff hasnt been touched in nearly a year or so. It works fine here.

Perhaps a better question is this. What I was trying to do was to store a pointer to the channel playing any given sound, and if that same sound was played again, it would stop that sound and would play it again from scratch.

So it’s a mix of wanting only 1 playing instance of a sound as well as forcing it to restart if the system attempts to play it again.