MultitrackStudio for iPad 3.4 (March 25, 2019):

• The editor grid can now show triplets (or any tuplet), or have swing.
• The onscreen MIDI keyboard now allows for loading an AU MIDI effect so 3rd party keyboards can be used instead.
• The onscreen MIDI keyboard is now resizable.
• AU MIDI effects that require an (unused) audio input connection are now supported.
• AU MIDI effects: timing accuracy improved.
• Fixed: quantization triplet options had wrong names (triplets of 1/4 instead of triplets of 1/8 etc.)

MultitrackStudio for iPad 3.3 (March 11, 2019):

• AU plugins: Options menu ('hamburger' button) now has 'Large View' option.
• AU MIDI instruments that can produce MIDI output now have a 'Record MIDI output (to this track)' in options menu. You can use this to record any keyboards the AU UI provides. This option is enabled by default. (requires iOS 12)
• Significant AU compatibility improvements.
• Songs now remember the Solo buttons.
• Improved support for 11" iPad.

MultitrackStudio for iPad 3.2 (February 28, 2019):

• MIDI editors: you can now select a note by just tapping it (you no longer have to wait for the selector to pop up). Also applies to dots in automation/MIDI controller editors.
• MIDI editors: notes being added are less likely to be covered by your finger.
• MIDI editors: New 'Duration only' quantization type. The existing 'Full' en 'Keep Note Off' types have been renamed to 'Start and End' en 'Keep End'.
• MIDI editors: Quantize resolution selector menu now has 'Type value' option which allows for entering tuplets. You can type '5 in 1/4' to quantize to quintuplets of 16th for example.
• Score editor: vertical zooming now uses much smaller steps, this makes it more useful.
• EQ: graph now has 6 colored dots, corresponding to the 6 EQ bands. Dots can be moved (the corresponding frequency and gain knobs will be adjusted accordingly). Dot movements can be recorded as automation (Pro Extension).
• EQ can now show audio spectrum. The 'Spectrum' menu provides several settings. (Audio spectrum used to be displayed in the Master section only and you couldn't customize anything.)
• An EQ effect in the Master section can now display a reference spectrum. A standard one is built-in, and you can extract the spectrum from audio files using the 'Import' option.
• Master Limiter / Noise Gate: histogram 'curtain' movements can be recorded as automation (Pro Extension).
• External MIDI Instrument windows: Patchmap selection is moved to options menu ('hamburger' button). The default patchmap can be selected there as well (was in Preferences pane).
• Devices pane now has option to enable iOS measurement mode.
• Added audio latency options of 128 and 64 frames.
• SoundFont Player: better support for soundfonts with very large release times (like 'GeneralUser GS'). You need to import the soundfont again to benefit from the improvements.
• AU compatibility improvements.