Today I installed this gizmo from www.pie.net that provides stereo RCA
connectors as a line-level auxilliary audio input to the Monsoon head
This is on a 2000 Z28 Coupe with the UN0 option (Monsoon audio, single
CD, 500W, 8 speakers).
The device is the PIE #GM9-AUX:
which just plugs in-line to the 9-pin data port on the back of the
head unit. Truely it was a 10-minute installation and now I can plug
my iPod into the new auxillary input and it works great.
With the adapter installed, the head unit works as normal until you
press the CD/Aux button when there is no CD inserted. Then it picks up
the Aux input and whatever is connected to that plays through.