With the wh20 you will need the inline xlr to 1/4" transformer and I use a 90 degree adapter so it don't stick out so far from the keyboard. You will also need a short xlr to xlt extention cord because the mic has a very short cord. This is my setup too.
any questions just ask and I will try to help.
MEL
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KORG PA1000, KORG PA900, 2 BOSE S1 PROS, 2 BOSE L1 COMPACTS, YAMAHA STAGEPAS 500, ROLAND VP7