Ergoline Sound System - External Music Source
 

Trying to run my in house audio into this control box so that the bed can play our preset audio instead of the music CD in the control box. Per the manual and schematic, I've connected the external audio in into "Plug 91" (L/Gnd/R). When the bed starts, I change the audio track to CD.00, but get no external music source.

I've tried with direct audio input (pre-amplifier) and running in after an amp.

Has anyone here tried this, and am I looking at something wrong?