I'm looking for a long (between 5-30 seconds, depending on the situation) stereo (pan/pingpong) delay. The catch is, I need it to attenuate some highs, degrade, or add some "tape" warmth and warble. I also need the delay time and feedback level to be adjustable in real time, with a physical knob or with MIDI control. Basically I'm looking to replicate the Frippertronics setup for creating long, ambient textures. Using a digital delay for this sounds too cold and inorganic to me (sorry for the cliche). I'll be using a Memory Lane for a shorter, modulated delay, and then using the long pingpong delay as a looper. Anyone know of a rackmount or pedal unit that can do this? I know the DD-20 has enough delay time, but there's no filtering or EQ adjustments in pingpong mode. Also it would be great if I could bypass the delay input while still retaining the feedback (so I would be able to make a "loop", then play over it without adding to it). I have a nice chain of VST plugins that do exactly what I want, but I don't like the stability, fragility, and latency issues that come with using a laptop live. Ideas?