The iMic Control utility provides additional features and control for the iMic USB audio adapter. The software is free for iMic users. Currently the iMic control supports output treble, bass, volume, balance, and mute as well as input gain. Some functions such as audio input gain require that you hot plug the iMic before the new settings take effect.
Version 1.5 includes an adjustable input gain control. This allows users to adjust their sound input level when recording music or voice into the Mac. This is especially useful for people recording sound into iMovie. Although iMovie can record voiceovers and music directly, it has no way of adjusting the level of sound being recorded.
Mac OS 9.0 - 10.x.
*Previously available here