Audiobus: Mixer for music apps

- Increased visibility of mixer scale labels and DSP meter

- Fixed an issue with stuck notes if multiple consecutive note ons received, with no matching note offs
- Fixed a performance issue with displaying MIDI sources list
- Colour tweaks for dark mode

Minor Audio Unit time sync fix

- Tweaked connection timeout error reporting to indicate that out-of-date apps may still function with reduced functionality

From version 3.4.23:
- Revised app launch procedure to account for new "Local Networking" prompt behaviour in iOS 14.2/14.3, and added detection for communication failures with prompt
- Fixed layout issues for iPhone 11/12
- Added workaround for iOS 14 icon bugs
- MIDI clock receiver fixes

- Revised app launch procedure to account for new "Local Networking" prompt behaviour in iOS 14.2/14.3, and added detection for communication failures with prompt
- Fixed layout issues for iPhone 11/12
- Added workaround for iOS 14 icon bugs
- MIDI clock receiver fixes

Fixed an issue with Audiobus Remote connections
Added AirPlay output support

Bug fixes

New intro screen, bug fixes

Compatibility improvements

Fixed an issue affecting some MIDI apps causing “Recovering” loop

Fixed a rare state saving timeout issue on some devices

Minor bugfixes

- Fixed issue with unavailable MIDI ports if other apps launched before Audiobus
- Fixed a potential crash shortly after startup, if other Audiobus-compatible apps already running in background

Fixed a screen responsiveness issue when showing preset state save feedback on iPad Pro 11" on iOS 13

Fixed an issue where changing a preset from within an Audio Unit interface could crash Audiobus.

- Fixed an issue when switching between AU user and factory presets.
- Fixed timing issue that could occasionally cause some apps or audio units to miss the initial downbeat.

- Fixed a bug that could cause crashes when loading a preset with multiple instances of an AU that isn’t installed
- Added a new Bluetooth permission flag required for iOS 13

Improved Japanese localization

- Fixed unavailable port issue with loading AUs from some presets
- Increased timeout duration for incoming MIDI, to fix issues with long notes in Xequence
- Added Japanese localisation

- Fixed some issues with MIDI Learn bindings for MIDI ports when used with more than one pipeline simultaneously
- Fixed VoiceOver accessibility for mixer controls
- Fixed sync issue between MIDI Clock and Link when Link tempo changed
- Fixed issue where setting hardware buffer duration back to original value (after system-originated change) could fail

- Added hardware sample rate controls
- Added 2048 frame latency setting for old devices
- Fixed Link delayed transport start with some Audio Units
- Fixed an issue with AU discovery on iOS 10 and earlier
- Fixed some issues with error reporting when an app crashes
- Workaround for iOS 12.4 IAA bug: Don’t launch apps with receiver ports into the background on iOS 12.4.
- Various MIDI clock receive improvements

- Fixed an issue that could result in missing mixer panels
- Improved error reporting

- Added improved support for audio units with multiple MIDI outputs (eg Fugue Machine)
- Improved MIDI clock implementation to provide more robust timeline tracking for some devices
- Revised AU view keyboard view switch buttons
- Fixed issue with missing mixer controls for mic inputs when connected to speaker
- Fixed occasional crash when using audio unit screen
- Fixed jerky transition problems between app list tabs
- Fixed issue where doubled MIDI messages could start coming in when MIDI sources were removed and re-added, and when Patterning was launched.

New features:

- Overhauled preset sharing: now sharing presets will share the actual preset file, which you can AirDrop or save to Files, etc. Preset uploading (and sharing of preset links) still available via an "Upload" action.
- Revised AU view switching, and added an extra "reduced keyboard" view on iPhone in landscape.
- Persist connection panels in AU views, per-AU instance (preserving scroll position & opened apps, for each instance).
- Show AU Presets button on top bar whenever keyboard hidden (and in reduced keyboard mode).
- Persist search text across app/audio unit lists.

Fixes:

- Adjusted rendering order to make sure upstream nodes are always rendered before downstream ones, which should in particular fix silent audio with presets that use MIDI sequencers.
- Fixed a transport issue with some AUs (this fixes issues with Woodpressor AU, for instance).
- Fixed some VoiceOver issues.
- Fixed an issue where saved app state could be trashed when re-saving a preset without an app running (or where state saving fails for another reason).
- Fixed an issue where reordering effects could result in audio units being disposed and re-instantiated, losing their state.
- Fixed some latency compensation issues.
- Fixed an issue where MIDI learn profiles weren't being restored properly for sources with non-alphanumeric characters in the name (d'oh).
- Fix crashes when saving some control profiles.

- Added Bluetooth MIDI advertising, to facilitate incoming connections from other devices
- Fixed a crash when loading some Audiobus 2 presets
- Fixed mixer slider accuracy
- Mute all MIDI (not just notes) for muted MIDI sources

Introducing Audiobus 3.4, with tons of workflow improvements, including preset addition, MIDI sync, MIDI Learn improvements including support for Audio Unit and app output (hello LFOs, hello sidechain compression!), Audio Unit user presets and so much more that it's a little embarrassing.

Here's the complete list of what's new.

- MIDI clock sync! Now you can synchronize external MIDI gear and other non-Link-compatible apps via MIDI sync. Audiobus' MIDI sync will also act as a bridge between Link and MIDI clock.
- New "Add" button for presets: Now you can append a preset to your current session, so you can use presets like reusable components.
- Lots of big MIDI learn improvements:
- New MIDI Learn Receiver port, for using the MIDI output of Audio Units and apps to control your session. Great for LFO generators and audio-to-MIDI utilities!
- MIDI Learn binding triggers can now be assigned manually.
- MIDI Learn adjustment actions now have range controls, both for the incoming CC, and the final value.
- MIDI Learn toggle actions now have more configurations, including the ability to invert the incoming value from a CC.
- Audio Unit User Presets: Alongside Audio Unit Factory Presets, you can now create your own presets for each AU, which will be accessible across Audiobus sessions. You can also switch AU User Presets via MIDI Learn.
- Virtual MIDI Bridge input, for receiving MIDI from apps that support neither IAA or Audiobus MIDI standards.
- Brand new selector pop-up, with separate tabs for System, Apps and Audio Units, and support for favorites.
- Hardware input gain slider in Settings, for compatible devices.
- Added Link quantize duration setting
- "Mute" for MIDI devices now sustains currently-held notes until release, rather than immediately silencing.
- MIDI hardware and virtual MIDI inputs appearing in multiple pipelines are now treated independently, allowing for per-pipeline muting and volume control.
- Brand new, rewritten-from-scratch Audiobus manual at https://audiob.us/help
- Numerous bug fixes and improvements, including:
- Fixed crash when using “Copy” on unsaved preset MIDI profile.
- Fixed issue where MIDI Learn trigger listening becomes unresponsive after clearing.
- Fixed stuck MIDI level meter when away from mixer screen.
- Fixed occasional issue where app state saving fails.
- Don’t show “More” button on Connection Panel during MIDI Learn for AUs.
- Fixed some app and AU loading issues.
- Fixed issue displaying secondary AU MIDI output ports.
- Fixed some sample rate and route change issues.
- Fixed an issue where MIDI sources present on launch are not initialised.
- Assorted layout fixes and improvements.
- Fixes for iPhone XS Max, and AU screen fixes for Plus sized iPhones.
- Skip MIDI consistency tracking for single MIDI sources, which should enable apps/AUs that mess with MIDI in exciting and illicit ways to work better.
- Don’t autosave MIDI Learn profiles from presets: wait until the preset is saved to save the MIDI Learn profile of the preset.

- Fixed some issues when switching from a mono to a stereo/multichannel audio device - Fixed an occasional issue with non-functional switch-to-app buttons after audio session interruptions - Fixed issue where apps that were recently in a "Tap to Launch" state and then re-added to a session can drop out - Fixed occasional launch problem with old apps - Don’t show “More” button for remote triggers for AUs - Fixed crash when copying an unsaved preset's MIDI Learn profile - Fixed another occasional crash in MIDI Learn profiles list - Fixed some iPhone XS Max layout issues