I've tested the latest build. It works well, but I found the following issues:

1. The Percussion panel comes after the bottom bar (Workspace, etc.) in the Tab & F6 order.
   • Instead, the panel should go before the bottom bar in the Tab & F6 order.
2. Pressing the "Write" button immediately puts you in note input mode.
   • Instead, it should remain in normal mode until the user presses one of the pads.
3. After exchanging the position of two pads via keyboard, all pads gain a blue highlight and focus leaves the panel.
   • Instead, all pads should lose the highlight, and focus should remain on the destination pad.
4. The "Reset layout" option does nothing.
5. Ideally, the screen reader text for pads & footers should be like this:

Image
Pad speech:	Bass Drum 1 pad button	Side Stick pad button
Footer speech:	Shortcut B; MIDI C2; Base Drum 1 footer button	No shortcut; MIDI C sharp 2; Side Stick footer button

The screen reader might say row and column numbers afterwards, which is fine. You can test with your built-in screen reader.

Thanks for this @shoogle! I'll be addressing some of these points in upcoming "refinements PRs"...

1. We'll address this after the merging of For horizontal panels, show tab bar instead of title bar #22050 as this will change the navigation implementation slightly (see contentNavigationPanelOrderStart in that PR).

2. I'll address this in an upcoming refinements PR

3. I'm aware of the lost focus and I'll also be addressing this a refinements PR. As for the highlight behaviour, the spec suggests that the highlight remains after confirming the swap:

4. This was disabled after Percussion panel - save/load drum pad panel positions #25608 - some design considerations need to be made here before re-implementing.

5. Looks good to me but the spec recommends something slightly different (namely including the row/column). Happy to include tweaks to this in a refinements PR.

I don't see any of these as blockers so I'm going to go ahead and merge - I'll coordinate privately on some of the points I've mentioned above. Cheers!