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USB		imac 		pid $1705, vid $04D8 , drives 4
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SAM		source		drive 11
MVSS_MK2	slit1		drive 3
MVSS_MK2	slit2		drive 4
FW252		fwheel 		drive 2
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TM300		mono	use fwheel, use slit1, use slit2, use source
#
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