yeah - not a bad go - not a fan of xpan or rosie - do you really need crossfading? I'd go happy nerding panmixjr/stereo mixer instead and a 2hp headphone module

which would save 4hp with the 3hp you already have free - that gives 7 which is a pain - something 4hp and something from the erica pico series - or maybe 2 2hp modules - maybe they do a crossfader if you need it

you might want to update your maths to a more modern version - the one with white knobs is the latest!

"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia

Utility modules are the dull polish that makes the shiny modules actually shine!!!

sound sources < sound modifiers < modulation sources < utilities