What is CD Playthrough ?

CD Playthrough is a program that no owner of a 660AV, 840AV, or Power Mac with internal CD should do without.  The “user” mode of this program bypasses the Sound control panel to do three things, if possible:

1. set the sound input source to the internal CD,
2. maximize playthrough volume level, and
3. change the sound out rate to 44.1 kHz (thanks a million to Gary Anwyl)

CD Playthrough can also reset to what I call the “system” mode, whose various settings are required for PlainTalk Speech Recognition, GeoPort Express Modem, and Apple Phone operation:

1. microphone as the sound input source,
2. playthrough turned off, and
3. sound out rate at 22.050 kHz on a Power Mac, or 24.000 kHz on a 660AV or 840AV.

Finally, the “user” mode is so named since copies of CD Playthrough can be redefined with different settings, as desired by the user — you.

Wang, James. (1994). Don't Read Me! Electronic Document.

Download CD Playthrough for Mac

Architecture

Motorola 68K

System Requirements

From Mac OS 7.1

Compatibility notes

Minimum Requirements

• Centris/Quadra 660AV, Quadra 840AV, or Power Macintosh
• Internal Apple CD300i or CD300i Plus CD-ROM drive
  • Third-part CD-ROM drives must be hooked up to the internal audio mixer on the motherboard
• System 7.1
• Sound Manager 3.0

Emulating this? It could probably run under: Basilisk II