aux 1: nux tapecore - sounds incredible for how cheap it is, can’t recommend it enough
aux 2: zoom ms70-cdr - super broad range, some amazing algos in there but still a bit “eh” compared to software reverbs + the noise floor has a terrible high pitched whine so you need to be mindful of your gainstaging
aux 3: alesis wedge - it’s a quadraverb in desktop format. what more do i need to say? bonus points for full midi implementation + midi thru so you can sequence it from the OT
aux 4: raspberry pi with pisound hat running custom supercollider patches for weird granular and spectral processing, also midi sequenceable - for some of that early 00’s crazy IDM madness