So I recently bought a DSL20 and had a big problem, the aux in was way way too quiet. I'd have whatever I was using for the backing tracks to come from at full volume and the guitar always massively drowned it out, at least 4 or 5 times louder. I sent it back to Marshall who said it was working as intended now and while the aux in is louder than before, my guitar still drowns it out. Any other amp I've used hasn't had this issue, if I have the aux in at full volume it always matches the sound of the guitar well so I can hear it properly and still play along. I really don't want to send it back for a refund as I love the sound of the amp, but it's a big issue, any advice?