Disable the sleep mode from activating after a certain period of time whenever an audio playback is active in Mac OS X, but no other activity is detected in the system. Maintain the playback indefinitely until manual shutdown. The utility works with Mac OS X 10.5.
SoundStay is a utility for Mac OS X 10.5 or later that stops the audio output from going to sleep. On some macs the output turns off automatically after 30 seconds of no audio, causing a popping noise, and a delay before a sound plays while the output wakes up again.
SoundStay prevents both these issues.
Please note that due to the nature of the task, SoundStay will also prevent the system from sleeping automatically.