I have not sound in ZC for Linux. The sound file is roughly 1/4 the size of the sound file for the Windows version. I've tried substituting a sound file from another download, but the game refuses to start. With the original sound file, I can play the game, but without sound.
Where to get sound file for the Linux version?
You'll need to contact Koopa or Sean. I'm afraid I have no experience with the Linux builds.