I've got a similar problem. I'm running ALSA drivers, and I *think* I've got the dmix plugin enabled. Now,from what I read, this allows Linux to use the famed DirectAudioDevices (i.e.: non-sucky JavaSound) as well as mixing multiple lines/channels together.
My game already sounds like a charm under Windows with DirectSound-implemented JS, using both Clips (in menus) and SourceDataLines (in game) playing multiple concurrent sounds, so it's not like I'm a total JavaSound noob.
I've got the following problems:
A - The same code that detects multiple/infinite channels for my sound card (mobo-nforce2) under WinXP detects only ONE such line under Linux. Using Mixer.getMaxLines(DataLine.Info). Assuming problem B doesnt exist (see below), this would theoretically allows me to only play one sound at a time. That ain't enough.
B - When my game does its first Clip.open(AudioInputStream ais), it throws a "javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED, 22050.0 Hz, 16 bit, stereo, little-endian, audio data not supported." Funny thing is I check the availability of my line and the mixer tells me I've got (only) one (see A), in the same format as my Clip object.
So my guess is dmix is not enabled correctly, which prevents my game from doing soft-level mixing and returning multiple/infinite channels to my code. Another process/app is somehow hijacking my only line, causing both problems to be sound showstoppers (I wish that was a pun).
Can somebody tell me if my above assumptions are correct ?? Are there people who have played *multiple*, *concurrent* sounds under Linux, on 1.4.2 or Tiger, using DirectAudioDevices (NOT the high-latency Java Sound soft mixer engine ! ) and lived to tell? If so, PLEASE reply to this thread, you've just become my new friend !