Martin I got a pinpoint today at 8 1/2. I unplugged the headphones and got a good strong audio on the pinpoint. it was loud enough that i never had to remove my headphones from my head to hear it. It sounds like you have a problem with your machine, I would call whites. You may have to send it in on that one.

I know it's a depressing thought to have to send it in but the sooner you do it the sooner you will be hearing those deep pinpoints and digging deeper targets. Good luck

Let us know how it goes.