Fix track navigation step size

[daxliniere]

What changed

• make Track Down/Up move the control-surface window by one track
• preserve the calculated surface width for Bank Down/Up, including extenders
• correct the documented MCU note mapping for notes 0x2e through 0x31

Why

The Track Down/Up buttons currently duplicate Bank Down/Up and shift eight tracks at a time. The hardware sends distinct MIDI notes for all four controls, but the code that selected a one-track movement for notes 0x30 and 0x31 was commented out.

Validation

• built the standard Windows x64 reaper_reamculive-x64.dll target successfully
• MSVC 19.44.35228, Windows SDK 10.0.26100.0, CMake 4.3.3
• confirmed the generated DLL is x64

[ak5k]

Hi! Navigating-only-by-banks-of-8 has been a deliberate design choice, since that's how essentially all digital live audio consoles work.

[daxliniere]

Hey Aaron. Yes, but there are, at least in icon Platform M+, one pair of buttons labelled bank up/down and another pair labelled track up/down.
I have left the bank switch buttons as they were and simply corrected the track switch buttons.

I have a bunch of other stuff I'm working on in as well, and will share PRs for them, too. You can decide which (if any) you'd like to implement. 😊

[ak5k]

Hey Aaron. Yes, but there are, at least in icon Platform M+, one pair of buttons labelled bank up/down and another pair labelled track up/down. I have left the bank switch buttons as they were and simply corrected the track switch buttons.

I have a bunch of other stuff I'm working on in as well, and will share PRs for them, too. You can decide which (if any) you'd like to implement. 😊

Yes. In default configuration in studio environment the Mackie/MCU controllers have such features. However, the goal of this project was/is to repurpose MCU controller to emulate digital live consoles (namely Midas/Behr M32/X32), i.e. repurpose Rec-buttons, have fixed page navigation and so on. Also, the dedicated/fixed master fader is essential for live use. It's basically a security feature for live environment; it provides instant physical access to "shut if off!" if something goes seriously wrong.