FYI - Music coming from the speakers while headphones are plugged in is normal for the Rachael amp.

From Steve when I asked him a while back:

"Yes, it is normal. If you don't want the speakers to play, we recommend using banana jacks for your speaker cable to amp connection and then lifting one from each channel when you use the phones."

I have no idea why there is no sound from the headphones though . . .

Sam