I had been using Inerzia Timer happily, but after updating to 1.1, the alarm doesn't sound any more! I went into preferences and double-checked the volume control which is set at 100%. I then uninstalled this new version, re-installed version 1.0 and the alarm came back. I guess for now I'll stick with 1.0. (The 1.0 version I have says 3.8 Intl - maybe that makes a difference since my OS is in French?)