Hard to answer this until we know more about what types of midi devices and how many devices you are using. Are you using multiple keyboards, controllers, rack mounted synths, effects etc? Do you program Change Controls (cc's) into your tracks? Do you drive one midi device from another? If you do any of these, you might want to consider a midi interface, rather than or in addition to, an audio interface. Audio interfaces tend to have limited midi in/outs and thru's.

Traditionally, many have daisy-chained their midi units. In this type of setup you would be limited to 16 channels. If your units are multi-timbral, they could support up to 16 midi channels each. From my experience, driving multiple rack modules by controllers and DAW tracks works much better with midi interfaces.

For example, I tend to use RB more so than BIAB. In my setup, I run 5-6 midi tracks from the RB to control one multi-timbral synth rack, another 2-3 midi tracks to another multi-timbral synth module, a separate midi track to a vocal processor and record my keyboard midi parts on another track.

Just some food for thought.

Jeff

Win11, Intel i7 7700K 4.2Ghz, 32Gb RAM, 2x1Tb HD, 500Gb NVMe, BIAB/RB 2025, MOTU 828MK3 audio, MOTU Midi Express, Yamaha Montage 7, DX7II, TX802, Motif XS Rack, Roland Fantom XR Rack, Oberheim Matrix 1000, VoiceLive3 Extreme, Kontakt 6, SampleTank 4.3