It is a VFX. I don't see anything in the software notes that jump's out at me. It does state that all VFXs should be upgraded to OS 2.00 or above.

I bought them off eBay from a seller who has a number of similar EPROMs listed for different synths. To be fair the seller has offered to take them back and give me a refund. I would expect if there was a corruption of the OS that they wouldn't boot in the machine at all; at least that's my experien...

Hello, I've got an Ensoniq VFX that I replaced the OS EPROMs upgrading the OS from 1.7 to 2.10 my problem is that with the new OS installed I get weird crackling sounds that sound like they were run through a delay circuit with the regen cranked way up, in that they start out relative minor and buil...