Unision

A free, calm, and non-obtrusive soundset for the Adium IM client

Version: 1.1
License: Free
Operating System: Mac OS X
Homepage: www.djgalbis.com
Developed by: Ricardo Galbis

Unision is nice and unobtrusive, easily distinguishable, Adium soundset for your Mac. The notes are in a high key so you can distinguish it from other background noise.