Here’s a relatively simple starting point. I use a 24 PPQN clock in because of how easy it divides up…
Start a pattern that’s 8 1/8th notes (Step=12) with no gate and all the same note. Add gates to the rhythmic spots you want and change a couple of the notes so there’s some variation. I’d go for one on an odd number and one on an even number. Now put all the odd steps into group 1 and all the even steps into group 2. I’d tie group 1 to the X gate and group 2 to the Y gate. Modulate to your heart’s content, though I would probably avoid playing with step length unless you’re applying positive to one side and negative to the other (make the pattern swing).
I highly recommend using CV-B outputs because changing those can make a sequence sound entirely different. When using slope to modulate, if your goal is to stay relatively musical, I’d recommend setting pitch CV to be pre-lookup and step CV to be post-lookup. For a more advanced technique, you can use the slope inputs to modulate by step one measure/pattern at a time. Or whatever rhythm you’d like. It can also be fun to select a pattern or group (esp if your loop has multiple patterns) and hit the Invert and Rotate buttons while the sequence is running.
For live use, I typically have 10-20 parts setup so you can start on one and then move to the next. Bu the next can be the same base sequence in different sets of groups so the modulation options are different. It makes for something that sounds different but very cohesive and shares motifs.
On last comment, using scale masks if very helpful when modulating pitch. You can stay in a key. Hope this helps!
EDIT: In rereading your original purpose, I don’t know that this quite goes from zero to a patch or would make sense to create a live setting, so I apologize if that’s your true intent. However, this is really a framework to work with that you could always pull up as a template and build from.