Hi Infiltrator,
the crackling/clipping noises you hear are probably a bug that we noticed in the last version, that happen only on auxiliary outputs. Can you confirm you are using the Aux outs? A new version which will correct this (among other things) will be released next week. In the meantime, the "main" and "phones" outputs should work well.
About the slots/zones:
- the easy way: you can just use the "config" menu and select "multi-timbral" (this option will be called "multi-channel" in the next version for more clarity).
- the less easy way: each slot is associated to a keyboard zone, which also has a MIDI channel. If you want 2 slots on 2 Midi channels, just activate 2 zones, for example A and B, then assign Slot1 to zone A and slot2 to zone B, then set the MIDI channel of the zone A, then set the MIDI channel of the zone B.
For now, forget about the "CtlCh" boxes, which set the control MIDI channel of the slot (used for automation).