My Sequential Circuits modular DDL is one of those....
I've made such great recordings with this dog I can't get up off it! It's 2 secs of delay was the canine's fecal remnant back in the early 80s. It does a sine wave sweep while in realtime that sounds like Henry Kaiser and no modern digital delay [stompbox sized] can get it.
In better economic times I should be able to pay for an Eventide Eclipse by selling it. I've only see one other, the members of Negativland have one!