hello line 6 nation    i have been down loading mp3 backing tracks on to my comp   i then use audacity to convert them to a wav file then send them to the sd card      mono 16 bit  44     1st one was fine all the rest have same problem. the back track sounds great but can hardly hear my guitar when ply or record over the track    when i play back the recording i can haer the guitar slightly better but still to low    ideas anyone ? could it be the wav file   thank you