Thanks RB75
I think I have the 507. The sync doesn’t work as you can only sync in the wrong direction.
I guess the solution is sorting out the awful pure audio sound. It shouldn’t be so grainy and bad.
I am using my PC’s headphone out connection into red/white cables into the ‘CD’ input currently. Sounds fine with Pro Logic Music or All Channel Stereo, but quiet and quite frankly awful in pure audio mode. I’ve tried this with my phone too directly and it sounds just as bad.
Any ideas more than welcome!