Lust is two seperate PT2399 delays running either in series or parallel. One pink and one brown where the pink delay runs into the brown if the pedal is set in series.
The pink delay also has an expression input for the time knob. So you can drastically speed up and slow down time making for some spaced out effects that you can then have echoing in the brown delay.
Both of the delays go from regular delay to completely maxed out delay times pushing the PT2399 to completely disintegrate you signal. So they can echo for a really long and broken time with the feedback set high (kind of as a very lofi slowly disappearing looper).
Both the delays feedback is also controlled by a momentary footswitch. That will make Lust sing and scream if pressed (more so in short delay times).