I don't have an SD7, but an SD40 and find organ voices, many times, will be louder, and this isn't just the SD40. It is annoying to have to adjust the volume when I get a bad surprise like you.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact