The K250 was indeed groundbreaking. Not only was it the first easily portable instrument that employed computer architecture to achieved its sounds, but it was also one of the first with a SCSI interface enabling the user to add external hard drives to store the sounds (a very big deal at the time). It also had one of the first samplers, available as an option, that had a sample rate that went up to 50kHz.
As we jump forward 30 years, Kurzweil Music Systems is still one of the leaders in high quality electronic keyboards while so many other computer based music systems (like Synclavier and Fairlight) have fallen by the wayside.
Here's a great video on how Ray went from creating systems for the blind to the MI business. Note some of the vintage segments of some really old audio gear.
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