Hello everyone and thank you in advance, I have just bought a TASCAM portastudio 424 mkiii and I think something doesn't work fine. The problem comes when I set to off a channel previously recorded. I thought that the signal recorded in this channel wont sound. However, I noticed that if I set the headphones level very high I can always hear anything. The same happens when I set to tape and the fader is down to zero. Is it normal or shoud I repair something? Thank you.