With the advent of System 7.5 Update 2.0 and System 7.5.3, the "Internal CD" and "Playthrough" options no longer need to be selected in the Sound or Monitors & Sound control panel in order to playthrough an Audio CD to internal or external speakers.
An Audio CD will playthrough no matter which selections are made in the control panels, except for mute and volume changes. The change was made for PCI-based Power Macintosh computers only. However, future versions of the Mac OS may implement the change for other Macintosh computers as well.
This article was published in the Information Alley on 25 March 1996.
Article Change History:
26 Mar 1996 - Added Info Alley information.