Delta Lab
Probably lost in the annals of history, the only proof I can find of Delta Lab existing is their used delay units for sale throughout the net. As far as I can tell, they were very productive a while back, and had a long list of Effectron and Echotron units... they're pretty ubiquitous, and I know a few people that had stumbled upon them in the past and were thrilled to se one in my rack, as much as I was thrilled to find it on sale for cheap in a used/trading music store. These were never high end units, as far as I can tell, and you can still find them for under $100 (although being "vintage" and listed erroneously as "rare," I have run across people trying to sell them for over $1,000)... but there's a lo-fi resurgence in the world, and nothing sounds quite as lo-fi as the digital rack gear from the 80's.
What originally attracted me to this unit was its modulation capabilities-- the range of controls allows for a variety of chorus, flange, and phase options (as most of these effects are based on modulated delay lines), but also, because it can be set 100% wet, it can be used as a true pitch-shifting vibrato (a hard effect to come by). Also, because of its modulating and pitch shifting abilities, the delay time is "twistable," and, coupled with a runaway-echo style feedback, provides all of the self oscillating wild UFO sounds you can hope for. There's options for positive and negative feedback, as well, which is very cool for the chorus/flange effects.
Because we're dealing with "vintage" consumer-level digital, here, the unit itself is somewhat noisy and the echoes have a very distinct character to them; the runaway feedback, especially, has a fantastically junky quality to it. Though it can be set subtly, I prefer it for wild special effects-- I have better delays for subtle atmospheres and soft, swirling modulations. Also, it is usable live, with pedal switching for both the effect and a great Hold function (which locks the current echoes in place indefinitely, allowing you to play under them), which is actually more useful than most delay units that offer a poorly integrated looper (Boss and Digitech, I'm looking at you). I would enjoy having this unit available in my live rig, but I'm encumbered enough without adding rack gear, and I'd have to develop a way to switch this unit out of my way entirely when it was out of use, because I just wouldn't want this thing's AD/DA converters ruining my tone. All in all, it's best applied in the studio.