Congratulations on getting the sync going. I looked over the 2S patchbay and there's also sync (clock) out. This will be useful if you have to share sync with other modules. If that's the plan, then look into clock dividers/multipliers. I use the Temps Utile for this as it can divide, multiply, sequence gates, Euclidean, etc. Sometimes you will want modules to be triggered at a different rate than your master clock and not all modules can divide/multiply on their own. Also check into the "reset" functionality as a useful way to always keep modules in sync. This will be useful if you need to reset a secondary sequencer to its beginning position or reset an LFO to the beginning of its cycle.
At the moment I have a 2 input audio interface (Scarlett 2i4). It's not very practical for recording multiple parts at once. I'll be upgrading to an 8 input interface by the end of the year. Another option is the Expert Sleepers ES8. It has 6 inputs at synth level and can output USB audio to your computer or ADAT audio to an interface that supports an ADAT input. You'll have to decide what's practical... especially if you're using a computer that can't stack multiple interfaces. Again, read, read, read...