This is great! Rxo Inverse added helpful features and improvements. Here are some other things I've noticed.
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In the Instruments dialog, you can click on one of the instrument lists for the melody tracks, then the track number shows [ ] around it, then you can click on the wave pictures to change that track's wave.
In the Song Properties, there's now a BPM field. Note that the BPM field is for informational conversion only. You have to press the < button (the left button of the small pair) to convert it to a Wait value, or else it is discarded when you close the dialog box.
In the Edit menu, there's now a Swap Tracks command.
In the Operations menu, "Resize Song" was changed to "Change Resolution". Now when you resize, the Wait, Repeat Range, and Grid Display are updated so that the notes and measures have the same effective size.
In the Environment menu, you can turn on "Confirm Unsaved Discard". Then if you New, Open, or Exit with unsaved changes, you'll get a warning. (I don't know why Rxo Inverse made this an option and off by default. It seems like you would always want this and it shouldn't be an option you can accidentally turn off and forget.)
Resize By Dragging Notehead (enabled by default): You can now "paint" new notes by dragging from start to end. And you can resize existing notes by clicking on the notehead and dragging right. You can disable this if you want.
Resize by Clicking Notehead: The original method of left clicking on a notehead to lengthen and right-clicking on the notehead to shorten is still available, but can be disabled. When disabled, clicking an existing notehead (or double-clicking a blank spot) reuses the last used size, and right-clicking a notehead immediately deletes the note.
Fan Tracks' Notes: The original Japanese is very literal -- "Slightly shift the y coordinate of the notes in each track". This lets you distinguish overlapping notes a little better. [I used the word "fan" as in "fan sheets of paper to slightly separate the edges". Not sure how clear that is, maybe I'll revise that to something else.]
In the Edit Toolbar, there's buttons to Delete (erase notes but leave the space behind), Delete Time (remove space and close the gap), and Insert (insert blank space).
In the Track Toolbar, clicking Tr opens the Instruments dialog, and clicking Wait opens the Song Properties.
The Quick Help text mentions some new keyboard and mouse shortcuts. Some I found out on my own.
As Tpcool already mentioned, the bottom two rows of a QWERTY-layout keyboard can be played like a music keyboard to rehearse notes. (It doesn't seem to let you record or insert notes?) The menu option for Enable Keyboard During Playback lets you play during playback also. The C key on the keyboard plays a Middle C on the piano (OrgMaker octave 3). Press Tab+keys for an octave higher, Shift+keys for an octave lower.
The Edit Toolbar buttons have keyboard shortcuts now:
Current Track buttons = Num Pad 1 to 6
All Tracks buttons = Ctrl + Num Pad 1 to 6
Duplicate buttons = Num Pad 7, 8, 9, +
Insert button = Insert
Delete button = Delete
Delete Time button = Backspace
You don't have to go down to the select area to select ranges:
Tab+drag: Select range in piano roll, pan graph, or volume graph.
Tab+right click: Deselect range.
When you use the selection bar:
Ctrl+drag: Select all tracks
Alt+drag: Select beats
Menu+drag: Select measures
Outside of the selection bar, you can use Ctrl+Tab+drag to select all tracks. However, Alt+Tab is used by the operating system to switch windows. Instead, you can press Ctrl+G to turn on the beat selection option, then use Tab+drag. Menu+Tab+drag is technically possible, but hard to reach with one hand and use the mouse with the other hand.
At the left of the selection bar, you can click on the word Select to enable the "Always Select Current Track" mode. The Quick Help says you can also click on the Pan and Volume headers to light them up, but they serve no purpose.