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What on earth???

Markbass TA 501
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Markbass TA 503
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Im sorry if im being an utter noob but what do the top 2 (4 in the case of the TA503) dials and the side 2 (obvo not the line out and master) do?

Also i cant find much on TB about the Markbass TA501 and the TA503 does any1 have any comments?