MidSequer2

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v0.5.0-b
- Added undo/redo feature

v0.4.0b12
- Fixed an issue that the sound stops when playing time is over about 4 minutes
- Fixed an issue that sometimes the some vertical lines are not drawn

v0.4.0b11
- Tweaked SynthPad category tones

v0.4.0b10
- Fixed an issue that the app may crash just after storage permission dialog is closed in several devices.