via this auction, via Inverse Room
"Multivox CB-50 "Digital Chorus Box." This thing is very uncommon, so much so that I couldn't find a single reference to it anywhere online. It's a fairly basic solid-state analog delay, coupled with a chorus (you can only use one at a time), and is essentially a copy of the Roland DC-50 "Digital" Chorus. Stock, this thing has no delay time knob--it's ordinarily a fixed slapback. But I modded it, replacing a trimpot inside the unit with a panel-mounted knob (pictured) that does indeed allow you to adjust delay time. You can do it on the fly, creating the customary portamento-type sounds. Max delay time now seems to be around 300ms. The echoes fade out in a lowpassy way like every good delay. The intensity does not oscillate in its stock form, but I adjusted another trimpot inside the unit, and it does indeed now feed back and oscillate very satisfyingly. Chorus is pretty good--there is only an "intensity" knob, so it isn't hugely versatile, but it IS a modulated chorus, not a simple doubling effect. The echo intensity knob also seems to have some effect on it--perhaps on the LFO speed? In any event, it's a good sounding analog chorus, very much a Roland-style ensemble effect. I don't think the knobs are original, but they're like new."