PS Engineering turn input up

PS Engineering turn input up?

Some time ago there was a post on this forum on how to turn up the music input on a PS Engineering audio panel. I have an SL15 Apollo which was made by PS Engineering so I expect it to be the same. I can't find the post so hopefully someone will chime in with the answer.

I have a portable MP3/CD player that works great, my iPod doesn't so I am guessing that if I turn up the input I will hear it.

Thanks for any help.

PS engr

I was the one that replied with how to turn up the music volume on a PS7000 audio panel. You press and hold the AUX button and the button to the right of the AUX to increase volume and the button two to the right decreases the volume. I have no idea if this works on audio panels they make for other OEMs.