I know what all the 'knobs' mean except MID

I've only just converted from electric to acoustic

Any help?
Midrange, it's between Treble & Bass. hence the MID part
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this is barely a question. only an idiot would buy a zune.
MID is in between treble and bass frequencies, it's to control the amount of mids that pass through, some people like to boost them other don't...
one more thing,
mine only has Gain, Volume, Treble and Bass... do I need Mid?
No you don't really need it, but it opens up more tonal possibilities if you do.