video upload by Marc van der Holst
"Sorry about that; especially the recording the sound with my phone part. If I get bored – and I get bored easily, if you were wonderinig while watching this stupid video. Again sorry. There is just one other clip of the MFB 512, far as I know, it lasts 3 seconds and sounds great and just better in every respect. Except the special FX, maybe. If this doesn't sell (on Reverb), I'll make a proper video. With real explosions and stuff, and a love story sub plot line and Indiana Jones. A costume drama. Well, a drama for sure. Cheers!"
via this listing

So, great, and "great price, I've seen them go for a lot more!"
Yes, you may have, BUT here's the but, but, it's not so big a but, all is probably im Ordnung, but since you never know, I don't, I never know anything:
A) these have Trigger In for syncing, no MIIDI (which I thought it had and is the reason for selling), and I have nothing to check that with atm and
B) I've tried for an hour a little less but I couldn't tell you how to replace those (very nice, I think) presets with your own programmed patterns. You can definitely do something with that left know, something sequency, but I haven't figured it out yet, and I may never, you figure it out, you're smarter than me I know.
Both things I'm educatedly guessing are highly likely fine, but since I can't tell for sure I won't tell you for sure."