This is great news! I'm still using API v.4 in Reaper 5, but an update would be very exciting. Curious as to what "closer to the actual path of the sound trhough an analog console" means...
On analog consoles, the faders, knobs, and buttons are usually layed out based on how the underlying wiring and signal path flowed. It gave engineers a logical at-a-glance understanding of how the sound traveled.
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Honestly, I would MUCH rather prefer the flat 'sketch' you did than a realistic 3d theme. I would pay money if that were done right actually.
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This looks promising. Your mockups look really well thought out and legible. Do whatever you're gonna do, but I'll also say I would use the flat ones in a heartbeat. Really like the navy and grey color schemes.