2006 z4 E85 2.0 - Aux in retrofit now showing but not playing

Hi everyone, still new to the forum. Thanks for giving this your attention. I have plugged in one of those cheap eBay aux cables to my BMW Business stock headunit. For a few weeks AUX didn't come up when pressing mode. Today I changed a line in the RAD module using NCS Expert and now it shows! (NEIN_AUX to AUX, or something). My question is now what!? It still doesn't make any noise! Does it need to be in the VO/FA too? if so, what code? I've seen E60 use +NAUX and E90 use SZZ1A and SZK1A. Thanks.
 
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