Hey there, I am pretty new to home recording and I just got a second hand Tascam US-1800 pre amp. Someone else had it so my computer at least recognized the pre amp, and earlier in garage band it was picking up the electric guitar but there was no sound. I fooled around with buttons for a while and now somehow my computer won't even recognize the pre amp. I have no clue what changed but I'd love some suggestions. Thank you!