Sunny,
Try turning the Noice Gate on or off and see if this eliminates your hissing problem.
Oleg7,
The SM58A, according to DNJ, is an excellent mic and he's now using it regularly. As for the adapter cable, an XLR to 1/4-inch mono is the one that's needed. An XLR to 1/4-inch TSR will not work because the PSR-series of keyboards uses a 1/4-inch mono mic input--not balanced or floating.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)