“Everything I can think of (as an experienced keyboard guy), I checked.
All the keys work.
The oscillators all work.
All VCF functions work.
Portamento and noise generators all work fine.
The VCF stage has some internal noise, much more than new, obviously, so it functions as a feedback oscillator when the Q is set high- this, to me, isn’t a bug, it’s a feature, and a fun one.
One of the “tablet” style switches was broken off, but still perfectly usable, I kludged up an extension to make it easier to actuate- there are a bunch of old home organ models that use the same type of tablet (not Yamahas, though, which is what’s sitting here at the shop and easy to get to)
Serial #255385, I haven’t been able to pin down DOM from that yet.
Here’s a really good demo of the capacity of this instrument:
TvwFQf8D44U at youtube (in case the url is a problem).” Click here to search for synths on eBay