The debate between mono and Stereo is perpetual. You will have opinions both ways. My opinion only is, that since the stereo field, or sweet spot, is relatively small, and since you are playing with a band, mono is fine.

Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact