ScaleBud - AUv3 MIDI Keyboard1.7.1 - App Store

ScaleBud is a music theory tool for composers, artists and learners. It has more than 40 most popular scales and counting. AUv3 Plugin, Audiobus MIDI Sending/ Filtering and Standalone app included.

It has a very simple, single-view interface that you can choose the scale and key you want to work as well as note or chord mode selector on the left side. Right side lists the scale notes or chords you want to work with. In note mode, you can fastly jump between notes in the scale by selecting them from the list. In chord mode, you can see the triad, 7th, 9th, 11th or 13th chords for each note in the scale. You can jump between them quickly as well, by pressing the chord you want to play from keyboard. Also, in chord mode, you can set the octave you want to play for the chords from left side of the keyboard.

ScaleBud comes with an AUv3 MIDI plugin and standalone versions. You can directly control your iOS, Mac or PC audio apps with CoreMIDI. Just open the settings menu and select the MIDI Out you want to send MIDI to.

ScaleBud also supports Audiobus MIDI Sending and Filtering. You can send MIDI from Audiobus 3 app just like regular CoreMIDI workflow. Also, in Audiobus MIDI Filter mode, you can feed MIDI Input data from your hardware or MIDI app, and ScaleBud filters out the off-scale notes in note mode, or plays the corresponding chord, if any available, for each note, like a chorder, in chord mode.

You can use ScaleBud with Audio Unit version 3 hosts like Audiobus 3, AUM, Cubasis 2, Beat Maker 3, apeMatrix and Sequencism. As an audio unit plugin, it both maps/filters your MIDI Input to the MIDI Output you route, and sends the notes/chords you pressed from its keyboard. In chord mode, you can press any type of chord from the list in order to make chorder generate chords in that type. For example if you press a 7th chord, it will generate 7th chords for each note you send it from your MIDI keyboard.

Also, it has several presets but you can save your custom presets with the supported hosts. So, you can quickly jump between keys, scales and chords you want to work with.

ScaleBud is not an audio app. It just creates or filters MIDI data coming from input and sends them to MIDI output. It does not generate any sound in any mode.
You can always send feedback for bug reports, feature requests or rate the app from the Support section in Settings menu.

Standalone app requires iOS 10.0+
AUv3 plugin requires iOS 11.0+ and a supporting host app.

ScaleBud also offers its core components open sourced on GitHub. Feel free to fork them, send a pull request to make it better, open an issue to share your ideas or give them a star if you like them.
MusicTheory: https://github.com/cemolcay/MusicTheory
MIDIEventKit: https://github.com/cemolcay/MIDIEventKit
ALKit: https://github.com/cemolcay/ALKit

Version History This version fixes a crash when the C-flat key was selected.
Also fixes some control UI color scheme for iOS 14.2. 1.7.1 11/17/2020 Minor UI improvements. 1.7 10/10/2020 This version adds support for iOS 14.
Updates the music theory engine.
Updates Audiobus support.
Updates the key picker controller. 1.6.3 09/23/2020 This version fixes the touch insensitivity bug on iPadOS, introduced in the earlier version. 1.6.2 11/09/2019 This version adds the MIDI Bluetooth button to the settings menu for connecting Bluetooth devices within the app.
Also does minor color scheme change. 1.6.1 11/07/2019 This version makes UI iOS13 compatible.
Also fixes MIDI stuck problems when changing the key/scale/mode while a keyboard key pressing. 1.6 11/06/2019 This version adds a new settings item where you can adjust the size of your keyboard keys.
Adds pentatonic scale chords.
Increases the keyboard's key sensitivity.
Updates the Audiobus MIDI Sender 1.5 04/10/2019 Added MIDI panic button to the settings menu.
Fixed the MIDI stuck bug when you changing the octave while playing a chord.
Fixed the scale name rendering on the scale list. 1.4.1 02/14/2019 You can see the roman numeric values of the chords under the chord names on​ the keyboard. 1.4 12/10/2018 Keyboard scroll locking and chord inversions have​ arrived!
This version adds a settings strip above the keyboard, where you can lock the keyboard scrolling, set chord octave and enable chord inversions. 1.3.0 10/03/2018 This version fixes multiple AUv3 instance bugs.
Also, made some improvements. 1.2.1 08/17/2018 This version fixes audio unit recognition in Cubasis 2. 1.2 08/08/2018 This version adds the ability to use multiple audio unit instances in one host.
Also adds custom preset saving. 1.1 07/30/2018 This update adds MIDI Keyboard mapping/filtering feature to standalone mode.
Now you can select a MIDI input to receive MIDI input data, either filter off-scale notes in scale mode, or generate corresponding chords in chord mode, then forward to MIDI Output you selected. Just like in Audiobus MIDI Filtering and AUv3 modes. 1.0.2 07/27/2018 Fixes a bug when filtering MIDI notes in some scales. 1.0.1 07/26/2018 1.0 07/25/2018