My sound set up used to be able to handle sounds from different applications simultaneously.
Currently, though, if one application is playing a sound, it takes exclusive control of the sound device. If I try playing any sound from a second application, that second application is likely to freeze. Sometimes the first application will freeze or crash too.
There has been no hardware changes at all so I assume simultaneous sounds is still possible. There have been various software upgrades and configuration settings over time, but I couldn't say when in all of that I lost the capacity for simultaneous sounds.
My system has a computer running Mythbuntu that acts as a Pulseaudio sound server. It has a USB digital sound system attached to it. All computers on my network send sound over the LAN to that machine, and so any sounds from any computer come out of the same speakers.
Where should I be looking in order to troubleshoot this problem of no longer being able to handle simultaneous sounds?