Piano Roll
The Piano Roll is the flagship feature of Mupen64 1.1.9 and allows seeking through movies visually and editing inputs prior to the current frame.
- Weird behavior with more than one controller
- The list is gray and I can't click it
- The list works, but the joystick is gray
The Piano Roll currently isn't UX-optimized for multi-controller movies.
Editing multicontroller movies is possible, but comes with confusing drawbacks such as the playhead being limited to multiples of the controller count.
Editing functionality is only available during movie recording and when the seek savestate interval is non-0.
Check the settings and change "Savestate interval" to something like 120 or 240.
Verify that you have a selection in the list. The joystick only affects selected frames and when there are none, it's grayed out.
If you have a selection but the input groupbox has the caption "Warping...", you will have to wait until the warp modify operation completes to apply further modifications.
The Piano Roll is divided into 3 main sections:
The list is comprised of columns representing the playhead, the frame index, controller joystick and buttons, and rows containing the input data for a specific frame.
To move the playhead, click or drag in the first column. The piano roll will become gray and non-interactable until the emulator has reached the desired frame.
To change the selection, click on either the "Frame", "X", or "Y" columns while optionally holding Ctrl or Shift.
To modify the buttons, left- or right-click any of the button cells.
The joystick allows modifying the joystick values in the current selection.
If there's no selection or the Piano Roll is in read-only mode, the joystick won't be interactable and display grayed out.
The history listbox contains snapshots of the piano roll's state at certain points in time. Such "states" are comprised of the input buffer, the selection, and the selected frame.
Users can't remove items from the history stack, as it's managed automatically. The maximum size of the stack is 100 by default, but can be changed in the settings.
Selecting an item in the history listbox will restore the accompanying piano roll state.
Utilizing Undo/Redo changes the selection in the history listbox.
The Piano Roll has a feature-rich context menu accessible by right-clicking while hovering over any non-button column.