# Midiflow Scales (Audiobus) — Note remapper > MIDI note filter and remapper for Audiobus 3, optimizing for musical scales. (iPhone/iPad app by Johannes Doerr.) - Source: https://appshunter.io/ios/app/midiflow-scales-audiobus/id1107244767 (this page in markdown: same URL + `.md`) - Developer: [Johannes Doerr](https://appshunter.io/developer/622204117) - Category: Music, Entertainment - Price: $1.99 - Rating: 3.80/5 from 4 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 10.2 · 5 MB - Languages: American English - Released: 2017-04-03 - Data updated: 2026-08-18 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/midiflow-scales-audiobus/id1107244767/reviews.md ## What is Midiflow Scales (Audiobus)? This MIDI effect app for Audiobus 3 lets you filter out unwanted notes or remap them to a scale. Thin out tracks from a sequencer to create a reduced variation. Prevent wrong notes when playing on a keyboard. Generate harmonies by using the app in combination with Midiflow Transposer. + Filter out "wrong" notes that are outside of a scale + Remap notes to the closest "right" note + Play a scale using the white keys (or all keys) + Pick notes manually + Select from a list of predefined scales (Min/Maj Blue, Ionian, Dorian, ...) + Use multiple instances of this effect in Audiobus NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to affect the data going through the respective pipelines. SELECT ALLOWED TONES In music theory, a scale is basically a set of tones relative to a root note. Building chords and melodies from a scale identifies its unique sound. The most popular scale might be the ionian scale in C, which is made up of all white keys on the keyboard. The scale of all black and white keys is called the chromatic scale. Midiflow Scales is a note filter and remapper that is optimized for working with scales. The keyboard-style note selector lets you activate notes that should pass the filter and deactivate those that should not go through. You can also select from the list of pre-defined scales. If you select a different root note (default is C), the app will update the selected keys to maintain the scale. So, if you have selected the ionian scale in C, and then change the root note to G, you'll see the F changing to an F#. MOVE NOTES INTO THE SCALE Midiflow Scales can not only mute "wrong" notes, which are notes outside of the scale, but it can also move those notes inside. The selector at the bottom lets you choose between filtering out those notes or remapping them to the nearest note that is part of the scale. If possible, the algorithm assigns the activated notes to the keys of the ionian scale. What sounds complicated actually makes it very easy for you to play different scales just with the white keys, or transform a stream of notes into a completely different scale. PLAY THE SCALE WITH THE WHITE KEYS While the previous remapping methods ("Nearest" and "Filter out") correct incoming data to match a scale, Midiflow Scales can also reorder the notes on the keyboard, so that you can play the scale without thinking about its half tone/full tone steps and the root note: With the "White keys" option, all notes of the scale will be assigned to successive white keys. For example, if you want to play "Min Blue" in E, you then just have to play C, D, E, F, G, A on the keyboard. The option "Chromatic" does the same but with C, C#, D, D#, etc. CREATE VARIATIONS AND SECOND VOICES This note remapper has many applications and is really fun to use. If you have a melody programmed in a sequencer, you can create a bass line by sending the same track through this app and activate only one tone. Experiment with the remapping options explained above to either get bass notes on every melody note, or only when the melody reaches the root note. Thin out tracks by removing some tones to create variations. Or use this simplified version of the track in parallel for a second, layered sound. This is also very useful when playing live with multiple sounds. Audiobus allows you to chain MIDI effects, and doing so with Midiflow Transposer and Midiflow Scales lets you create second voices: First transpose the notes by 4 half-tones and then force them to the ionian scale, for example. ## Key features - Filter out notes outside a scale - Remap notes to the closest scale note - Play scales using only white keys - Select notes manually - Choose from predefined scales - Use multiple instances in Audiobus ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/midiflow-scales-audiobus/id1107244767/reviews.md ### 1/5 — Save your money! *2021-05-08* App stops working randomly and adds latency ### 1/5 — After iOS14 update it crashes in Audiobus *2020-11-08* Please update this app, I use it a lot. I haven’t checked your other apps yet hopefully some of them still work. ### 5/5 — Yay, thanks for white-keys scale mapping *2017-06-15* For those who don't know already, this handy app is designed to go between an Audiobus 3 Midi input and output. It takes the incoming Midi notes and maps them to a scale of your choosing or creation, basically helping you to never play a wrong note. Now you can also make it so that the scale maps to just the white keys, so you can, say, play an F# Hungarian minor scale just as you would a C Major. That's only the beginning of the many things this can do for you, especially when combined with the several other single purpose apps from this series. I highly recommend just grabbing the full bundle, whether you see a need for them all at this time. (Johannes, if you're reading this PLEASE make a free-form Midi note mapper that can transform any note to any other. This would be helpful for dealing with all the different mappings used by drum apps. Thanks!) ## Frequently asked questions about Midiflow Scales (Audiobus) ### What is Midiflow Scales? Midiflow Scales is a MIDI effect application designed for Audiobus 3. It functions as a note filter and remapper, allowing you to control which notes pass through and to adjust them to fit a chosen musical scale. ### Does Midiflow Scales require Audiobus 3? Yes, Midiflow Scales explicitly requires Audiobus 3 to function. You need to insert it into one or more MIDI effect ports within Audiobus 3 to process MIDI data. ### What musical scales can Midiflow Scales use? The app supports a variety of predefined scales, including Major, Minor, Blues, and Ionian scales. You can also manually pick notes or have the app adjust to a new root note while maintaining the selected scale. ### Can Midiflow Scales help with playing scales easily? Yes, Midiflow Scales offers a 'White keys' option that reorders notes so you can play any scale using only the white keys on your keyboard. It also has a 'Chromatic' option for mapping to all successive keys. ### How does Midiflow Scales remap notes? It can either filter out notes that are outside the selected scale or remap them to the nearest note within that scale. This helps ensure that only musically appropriate notes are processed. ### What are the applications of Midiflow Scales? It can be used to thin out tracks from sequencers, prevent wrong notes when playing live, generate harmonies with other apps like Midiflow Transposer, and create variations of existing melodies. ### What is the price of Midiflow Scales? Midiflow Scales is a paid application, available for $1.99. This one-time purchase grants you access to all its features. ### Does Midiflow Scales have ads? No, Midiflow Scales does not contain advertisements. As a paid application, it offers an uninterrupted user experience. ## Version history (last 5 releases) ### 1.0.7 — 2024-05-07 Compatibility improvements for recent iOS versions ### 1.0.6 — 2020-12-01 Update for iOS 14 ### 1.0.5 — 2019-11-28 Update for iOS 13 ### 1.0.4 — 2018-06-15 Update for GDPR ### 1.0.3 — 2017-09-14 + Fixes for iOS 11 ## Apps similar to Midiflow Scales (Audiobus) | App | Rating | Price | Category | | --- | --- | --- | --- | | [Mini Synthesizer](https://appshunter.io/ios/app/mini-synthesizer/id1126845799) | 3.5 (12) | $4.99 | Music | | [QuantiChord](https://appshunter.io/ios/app/quantichord/id1439713799) | 4.0 (11) | $12.99 | Music | | [sqsl Latch](https://appshunter.io/ios/app/sqsl-latch/id1659829499) | 3.7 (3) | $19.99 | Music | | [ScaleBud 2 AUv3 MIDI Keyboard](https://appshunter.io/ios/app/scalebud-2-auv3-midi-keyboard/id1605842538) | 4.0 (10) | $6.99 | Music | | [SWAM Contrabassoon](https://appshunter.io/ios/app/swam-contrabassoon/id1458125131) | 5.0 (1) | $19.99 | Music | | [Multi-Tap Delay AUv3 Plugin](https://appshunter.io/ios/app/multi-tap-delay-auv3-plugin/id1444438070) | — | $4.99 | Music | ## More apps by Johannes Doerr - [iMIDIPatchbay](https://appshunter.io/ios/app/imidipatchbay/id622204114) - [Midiflow](https://appshunter.io/ios/app/midiflow/id879915554) - [English is Easy – Learn vocabulary with pictures and sound](https://appshunter.io/ios/app/english-is-easy-learn-vocabulary-with-pictures-and-sound/id1056841728) - [Midiflow Keyboard (Audiobus)](https://appshunter.io/ios/app/midiflow-keyboard-audiobus/id1092870508) - [Midiflow Splitter (Audiobus)](https://appshunter.io/ios/app/midiflow-splitter-audiobus/id1104669188) - [Midiflow Limiter (Audiobus)](https://appshunter.io/ios/app/midiflow-limiter-audiobus/id1107244412) All apps by Johannes Doerr: https://appshunter.io/developer/622204117 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-18.*