I managed to find a copy of Sound Designer (1.5 Universal) a while back to use with my old trusty Apple Mac Performa 630 (running Mac OS 7.5.5) and hooked it up using another old bit of vintage kit - my Mark Of The Unicorn 'Fastlane' 1 in 3 out midi interface.
Success! The Akai and Mac swapped file seamlessly..
I was hoping to integrate it with my Opcode Studio 5LX's but it doesn't completely work. While the Akai can receive the files from the Mac, there seems to be an issue sending files via the Studio 5's through the MOTU interface. I might be missing something though..
But, at the end of the day I can use my Akai s700 and save the samples onto my old P630 and Zip drive. It just requires changing a midi cable when using the S700 with the rest of my OMS setup. Not much of a hardship. I could get a Midi Merger though? That would fix that problem :-)