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Did the driver for the new MIDI cables not work?
Or was it the driver for the 3000S ? if so, it may have no driver for MAC OS X Sierra, owing to its being from a very long time before there was even MAC OS X 10.1.
Getting the driver to work may be a hopeless case... but tell me where you got the driver from? there might be a better source, for a better driver that would work. You never know... with information from you as to what source failed (so that I don't look in that place for sure), I can do a search for that rather unlikely thing, a driver for MAC OS X 10.x for a device from 1988. It will probably fail, but I can do that search, with that much information.