i'll start with saying you can use different scales for CV A and B, of course, but i think there is a lot to explore when sharing the same scale - this is due to the fact that both sequences are affected by the same 4 tracks, so one of the more unusual things about orca is that you have 2 sequences that are related in some way (also true with different scales, but easier to hear the effect when sharing the same scale). there is some interesting interplay when you have 2 voices playing from the same pool of 16 notes and both reacting to changes in parameters, but in different ways. and then play with track assignment, the sequences will change but remain related to each other. here's an example: https://www.instagram.com/p/BL0DmOADcdH
to separate them - so, normally, what i do is a typical patch: trigger outputs -> envelopes -> VCAs. unlike a typical sequencer in orca you can configure triggers independently from CV outs, but you can also do it the standard way where a trigger is fired whenever a new note is output - basically, assign the same tracks to the CV and the corresponding trigger output. do it for the 2nd CV too, and now you have 2 typical CV/trig outputs you can use to drive 2 voices. if you tune the 2 voices to the same pitch (or an interval) you now have 2 sequences that compliment each other in interesting ways.
since you can configure triggers independently from CVs you can also do some interesting effects where triggers are not necessarily triggered on each note change. so what you can do is mult the same oscillator to another env/vca pair and control it with another trigger. example: assign tracks 1&2 to CV A, assign track 1 to trigger 1, and track 2 to trigger 2. now use CV A to control an oscillator and put it through 2 pairs of env/vca, one controlled by trigger 1 and another one controlled by trigger 2. so you'll only hear some notes through vca #1 and other notes through vca #2, playing from the same oscillator. now play with attack/decay times and you get sequences that kinda flow into each other...
this is the kind of a patch that i find really interesting in orca, especially if you add delay to the mix, sequences that flow into each other, interrelated but different, changing together but in different ways. so with ansible you can do that times 2 - i'm really curious to hear what it might sound like!