Comparison

Midiflow Scales (Audiobus) vs Smart Scale Controller Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Midiflow Scales (Audiobus)

This MIDI effect app allows you to filter or remap incoming notes to fit a specific musical scale. It helps prevent incorrect notes, create harmonies, and simplify playing scales using your keyboard.

Highlights
  • 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
Features
Read full description

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.

About

Smart Scale Controller Pro

Control keyboard scale and tuning in real-time. Offers seamless control over musical parameters for musicians, unlocking new creative possibilities. Perfect for live performances or studio sessions.

Highlights
  • Real-time scale tuning
  • Transpose
  • Pitch bend
  • Preset management
  • Bank select
  • OTG and BLE connectivity
Features
Read full description

Smart Scale Controller is a professional-grade mobile application designed specifically to control the scale and tuning of your keyboard in real-time. Tailored for musicians, this app offers seamless control over various musical parameters, helping you unlock new creative possibilities. Compatible Keyboards: - Korg (Pa Series, Triton Extreme/Classic/Studio, Trinity, Kronos, M3, Krome, Nautilus) - JuzziSound 1/2 - Yamaha (PSR, MODX, Tyros, Genos) - Kontakt (Native instrument) Supported Features: - Real-time Scale Tuning - Transpose - Pitch Bend - Preset Management - Bank Select - Connection Options: OTG Cable for direct connection BLE Yamaha for wireless Bluetooth connectivity With Scale Controller, you can effortlessly adjust your keyboard settings on the go, making it the perfect tool for live performances or studio sessions. Explore new tunings, experiment with presets, and achieve perfect harmony with ease.

Screenshots

Midiflow Scales (Audiobus)3 screens
Smart Scale Controller Pro4 screens

Verdict

The call

The clearest difference is price: Midiflow Scales (Audiobus) at $1.99 against Smart Scale Controller Pro's $99.99. Midiflow Scales (Audiobus) also leads on in-app purchases (none vs 3) and rating (3.8 vs 3.4). Smart Scale Controller Pro's advantage is update cadence (every 3 weeks vs every 9 months) and review sentiment (50% vs 33%). On ratings volume, ads, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Midiflow Scales (Audiobus) costs $1.99 and Smart Scale Controller Pro $99.99 up front. Smart Scale Controller Pro sells 3 one-off in-app purchases. Midiflow Scales (Audiobus) asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Midiflow Scales (Audiobus) holds the better App Store score, 3.8 against 3.4. Both are backed by a comparable volume of ratings — 4 and 9 respectively. Written reviews complicate that: 33% of Midiflow Scales (Audiobus)'s written reviews are positive against 50% of Smart Scale Controller Pro's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Midiflow Scales (Audiobus) ships an update every 9 months, Smart Scale Controller Pro every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard6 real differences · 4 level
Midiflow Scales (Audiobus) versus Smart Scale Controller Pro: the parameters behind the verdict, then further details
ParameterMidiflow Scales (Audiobus)Smart Scale Controller Pro
Price$1.99 — better$99.99
Rating3.8 (4 ratings) — better3.4 (9 ratings)
Positive reviews33.3% of reviews50.0% of reviews — better
Number of ratings49 — better
Update frequencyEvery 9 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.2 — better15.0
Further details — not scored
Size5 MB68 MB
Age rating4+4+
DeveloperJohannes Doerr9390-0801 Quebec inc

Customer experience

Midiflow Scales (Audiobus)

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Smart Scale Controller Pro

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Midiflow Scales (Audiobus)

No in-app purchases

3 purchases

Smart Scale Controller Pro

One-time3
  • Unlimited Virtual MIDI Devices$4.99
  • Unlimited Preset Banks$4.99
  • Plugin Mode — AUv3 Instruments$30.00

Questions

Is Midiflow Scales (Audiobus) free?
Midiflow Scales (Audiobus) costs $1.99, with no in-app purchases.
Is Smart Scale Controller Pro free?
Smart Scale Controller Pro costs $99.99, and also offers in-app purchases.
Which has better reviews, Midiflow Scales (Audiobus) or Smart Scale Controller Pro?
Midiflow Scales (Audiobus) is rated higher. Midiflow Scales (Audiobus) averages 3.8 out of 5 from 4 ratings, while Smart Scale Controller Pro averages 3.4 from 9 ratings.
Do Midiflow Scales (Audiobus) or Smart Scale Controller Pro have ads?
Neither Midiflow Scales (Audiobus) nor Smart Scale Controller Pro shows ads.
Which is updated more often, Midiflow Scales (Audiobus) or Smart Scale Controller Pro?
Midiflow Scales (Audiobus) ships an update every 9 months, and Smart Scale Controller Pro every 3 weeks. Most recently, Midiflow Scales (Audiobus) was updated on October 24, 2026 and Smart Scale Controller Pro on October 25, 2026.

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