Audacity 2.2.0

What's new in this version:

Improvements:
- Four Selectable themes provided, with new 'Light' theme as default, plus option to customize

Changes:
- Menus Reorganized
- Extended menu bar provided
- New keyboard commands for working with clips
- Help buttons ? in Preferences, Effects, Generators and Analyzers - and other places
- Non-Greying out of effects when no selection (and explanatory dialog with help button)
- Playback of MIDI (and Allegro) files imported into Note Tracks is now available
- 'Center' option in Selection Toolbar
- Stem plots
- Major overhaul to documentation/manual including many new images and streamlined text on landing pages for in-program help

Other Changes:
- Append-record is now the default (use Shift + Record for old behavior, to record on a new track)
- The Esc key now cancels all click-and-drag actions. It also chooses among overlapping mouse click targets, which is especially useful in the Multi-Tool
- Sync-Lock button removed (use menu item or keyboard shortcut instead)
- New preferences and preference pages

Overhaul of much code:
- Overhaul of envelope handling code to deal with some anomalies
- Overhaul of exception handling for greater safety
- New Logo

Bug Fixes:
- Major work on bug fixing. 198 bugs that were in 2.1.3 fixed for 2.2.0
- The most serious bug fixed this time round was bug 437 which was about what happens when Audacity is recording and runs out of storage
- The problems of incomplete support for macOs Sierra have been resolved (including bug 290, bug 1567, bug 1702, and bug 1703)
- Most of the bugs fixed were more minor, such as bug 463 which was about a case in which the numbering on the timeline could display incorrect times