Fix: workaround for an issue in iPadOS 26.4.1 that prevented closing the mail composer.

Fix: workaround for an issue in iPadOS 26.4 that prevented closing the mail composer.

Fixes a text display issue on iOS 26.4.

Minor bug fixes.

- Some performance improvements.

- Fixed an issue on iPhone where Test or Practice mode was not stopped when rotating the device from landscape to portrait.

- Fix for layout issue on iPhone in landscape mode.
- Updated for iOS 26 and iPadOS 26.
- In iPadOS 26, the app supports proportional scaling. iPadOS saves your layout in both orientations automatically.

- Updated for iOS 26 and iPadOS 26.
- In iPadOS 26, the app supports proportional scaling. iPadOS saves your layout in both orientations automatically.

- iOS 18.6 adjustments.

- iOS 18.5 adjustments.

Polished some help texts and instructions.

- Adjustments for iOS 18.0.1

- Minor adjustments for iOS 18 and added support for new devices.

- Adds the famous Pachelbel's Canon chord progression in D major (Extra challenges menu).
- The Display menu includes color options for both the settings background and cells.

- Added some color options for the settings screens within the Display menu.
- Implemented textual changes and made various minor adjustments.

Now you can personalize your 'light' interface style with a range of background color options. To get started:
- select the 'light' style from the Display/Theme menu in settings.
- then open the Display/Background menu.
- choose from a variety of light colors to create your ideal look.

Staff background: also new customization choices in the Display/Staff Background menu.

iOS, iPadOS 17 adjustments (still supports iOS 12.1).

Chord progression function extras:
   - arpeggio patterns. These can be effective for ear training or play-along purposes.
   - a list of play-along tips, based on the experience of a group of students.
   - some new chord progressions.

Mail current exercise (in Exercise options menu) attaches a second MIDI file, generated by the Chord progression function.

Hide staff lines option (in Display menu). This may be helpful when playing along with the chords.

Chord progression function changes:
- Marimba added to instruments.
- Option to play the chord roots only.

iOS, iPadOS 16 adjustments.

- Dorian mode progression added to chord progression function (Extra challenges menu).
- Some single 16th note patterns added to the editor. These may help in creating percussive syncopated rhythm patterns as basis for bass lines.
- Minor other improvements.

MIDI technical update:
- Some MIDI devices bundle multiple MIDI messages in one packet. This is now supported.
- MIDI performance improved, preventing that MIDI messages are missed on slower devices.
- Improved support of the Note duration function (Extra challenges menu).

Minor adjustments for iOS, iPadOS 15.5.

Option in Display menu of settings to have a black color for the barlines (white in dark mode). This may help in practicing at higher tempos.

The chord progression Extra challenge function now has a progression type that follows the circle of fifths. This type is very common in music and good to become familiar with. See the wiki page on the circle of fifths for more details.

- Option to specify audio feedback for incorrect taps (displayed as X).
- For details, see the X-tap sound function in the Tapping menu of settings.