Sometimes the best ideas are the simplest ones. The Demiurge Instruments Dead Moon Echo is a UK-handbuilt delay based on the PT2399 with an intriguing twist: a second footswitch that lets you activate a momentary setting with new Time and Feedback settings.
A Tone control acts as a low pass filter to mimic darker tape-style tones, while the internal circuit, capable of running at 18v, can deliver plenty of headroom.
Check out the video of it, below.