Line 6 M13 stomp box modeller multi effects. Loads of different, highly tweakable effects patches and up to four on at once, saved in scenes of 12 so each of the four slots can easily switch between three patches.
You can connect two expression pedals and assign them to most parameters, there's an effects loop you can vary the position of in the internal chain, a really good looper, and lots of things are externally controllable by midi although I've only used that for tempo clock.
Lots of people use Line 6 units for their great pitch shift/whammy but there's loads more good stuff to get stuck into. It's in great condition, just a couple of small scrapes round the edges and comes with the original box, power supply and manual. Selling as the band I bought it for is no more and tempo-synced faux-dubstep wobbles don't really fit the other stuff so it's overkill in addition to my other board.
200 + p&p, open to trades (Aguilar tonehammer anyone?) so throw some ideas at me.
More pics: https://ibb.co/album/b6Au1F