We have been reported that a lot of people have no sound using the current 32 bit linux version (9.10.1) of Cube Combat. Research showed that this is a problem of the libsdl build parameters that we used when compiling the library delivered with the game. We will shortly fix this and release a new version soon.
As a workaround you can use your system SDL library if installed. It should be done by simply delete the libsdl.so from the directory linux/bin32.