Malibu Surround 64 - FAQs
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Connections - second CD-ROM connector 
The Malibu "ADD IN" (internal aux in) can be used for recording and playback 
from a second CD-ROM.

1) Connect a CD audio cable from the second CD-ROM to the "ADD IN" internal
   connector on the Malibu.

2) Open the Windows mixer, to Recording. 

3) Un-mute the Synth slier. 
   Note: Muting the "Serial In" slider has no effect on this.