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A really good delay, specially if one considers its price. Really small, and if you use those ultra-mini "cables" (which aren't really cables, but plugs), it can be for you to step simultaneously at two pedals at the same time. Be careful.
The rubber on the bottom is good for placing it directly over a aluminum board. But, with Velcro, I had to get rid of that because it was not fixing the Velcro on to it.
I would rather prefer if the echo and feedback knobs had a white mark showing the actual setup. Very hard to see. You have to go on feeling!
Those are minor things compared to its usefulness and price range ($30 - $50)
Donner Yellow Fall is a super powerful analog delay pedal that must be carefully controlled. I just about blew the roof off the Guitar Center store when I was testing it. Terrific addition to my synthesizer gear.