oh ryt sorry about the confusion, ipods when they are in ordinary ipod mode can only play music which has been imported onto them using itunes and there is no skipping or jumping. The wav files that have been recorded in linux cannot be played in ipod mode untill they have bee added to the itunes music library on a pc however all music on the ipod can be played in linux but do not play as well ie jumps, skipps.
As for the mic and voume levels im affraid you will just have to experiment as all i have tried using is a computer microphone infront of my practice amp on quite a low setting sorry