Hi Aro
distortion is usually caused by A/D & D/A converters overdrive. This happens for one or more of the following reasons:
-input signal level being too high, either at the source or boosted at input stage
-incorrect signal type/connector type matching. Eventides use XLR for +4 dB balanced and unbalanced signals (using balanced cables in both cases) and 1/4" jacks for instrument levels signals. What's your setup?
Regarding your second question, Pandelays& Tdelay 4 Plex have been always possible to be loaded in the same preset.
Probably your unit needs a CLEAR SETUP?
all the best
I