Comparison

Midiflow Motion (Audiobus) vs Nulltrack

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

Head to head
About

Midiflow Motion (Audiobus)

Control effect parameters in other music apps by moving your device. Fine-tune MIDI commands like volume or modulation to your desired motion range for expressive control. Supports multiple parameters and apps simultaneously through Audiobus 3.

Highlights
  • Control effect parameters with device motion
  • Use device rotation (X/Y axis)
  • Adjust motion and output value ranges
  • Send any MIDI command (pitch-bend, CC, custom)
  • Control multiple parameters/apps simultaneously
  • Integrates with Audiobus 3
Features
Read full description

This MIDI sender app for Audiobus 3 lets you control effect parameters of other apps – in a way that no touch screen can replace – by moving the device. Set any kind of MIDI command like volume or modulation as output and fine-tune it to the exact motion range you want to perform with. You can even control multiple effects simultaneously. + Use device rotation around the X or Y axis + Adjust the range of motion for controlling a parameter + Adjust the range of output values + Send virtually any MIDI command (e.g. pitch-bend, any Control Change like modulation or expression, and even custom MIDI messages) + Control multiple parameters and/or multiple apps at the same time by inserting this app multiple times in Audiobus NOTE: This app requires Audiobus 3. Insert it into one or more MIDI sender ports to control the synth apps in the MIDI output ports of the respective pipelines. THE IPAD IS YOUR CONTROLLER Without a doubt, the iPad's touch screen is a revolutionary tool for musicians. However, it also comes with sensors that can track how you move your device around two axes. Using those sensors to control effect parameters allows you to perform with a huge amount of expression. CONTROL ALL KINDS OF PARAMETERS Many synth apps allow you to "remotely" control their parameters via MIDI messages. For that purpose, Midiflow Motion can send virtually any MIDI command to those apps, through Audiobus. Just select from the list of available parameters and the app starts sending messages when you move the device. Not only can you use basic Control Changes for "volume" or "modulation", you can also use double-precision commands (LSB + MSB), RPN/NRPN commands or custom MIDI messages. If you want to play notes, you might want to add Midiflow Scales behind this app in the Audiobus MIDI routing in order to map the notes to a scale. ADJUST MOTION RANGE The range selector at the bottom allows you to narrow down the motion range in which you want to control the parameter. The maximum range goes from -90 to +90 degrees. Use either the slider or the learn buttons to adjust the range according to your needs. CONTROL MULTIPLE PARAMETERS You can insert Midiflow Motion in Audiobus multiple times. That way, you can send multiple MIDI commands simultaneously. Each of them can be configured independently. For example, you can control the cutoff of a synth by rotation around the x-axis, and use the y-axis for the resonance parameter. It is like an x/y-pad, but with the whole iPad as the controller. You can also control parameters of different synths at the same time.

About

Nulltrack

This mobile digital audio workstation offers a unique, grid-based approach to music creation, inspired by classic trackers. It includes built-in synths, a sampler, extensive modulation options, and mixing tools.

Highlights
  • AUv3 plugin support
  • Two built-in synthesizers
  • Built-in sampler
  • Extensive modulation options
  • Mixing features with track faders
  • Groove tables for swing/playback
  • Pattern locking to scales
Read full description

Launch price $4.99 — rises to $7.99 four weeks after release. Get it early! Nulltrack! It's null when you start and a track when you finish! Nulltrack is a tracker and digital audio workstation app for your phone. A different way to make music inspired by LSDJ and the Dirtywave M8. Features: AUv3 plugin support - bring your external synths and effects into your track! Two built-in synthesizers -- A versatile two-oscillator Basic Synth and a feature-rich Bass Synth. A built-in sampler -- record your own samples with your phone's microphone, load your own, or use the built-in samples, set loop points, slice, reverse, etc. Modulation -- Modulate nearly anything with LFOs, AHD / ADSR / drum envelopes, velocity, randomness, and key tracking, filter, panning, and more. Mixing Features -- track faders with solo and mute, 13 built-in effects, sidechain compression Sends -- share effects between tracks Customize your swing/playback with groove tables! Lock your patterns to a built-in scale! ...and much more! New to trackers? They're a fast, grid-based way to write music. Try it out! No ads, no subscription, no in-app-purchases, and no account needed.

Screenshots

Midiflow Motion (Audiobus)4 screens
Nulltrack4 screens

Verdict

The call

The clearest difference is review sentiment: Nulltrack at 100% against Midiflow Motion (Audiobus)'s 40%. Nulltrack also leads on update cadence (every 9 days vs every 11 months). Midiflow Motion (Audiobus)'s advantage is price ($1.99 vs $7.99) and device support (3 vs 1). On ads, in-app purchases and monetization model 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 Motion (Audiobus) costs $1.99 and Nulltrack $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Midiflow Motion (Audiobus) ships an update every 11 months, Nulltrack every 9 days. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

Scorecard5 real differences · 5 level
Midiflow Motion (Audiobus) versus Nulltrack: the parameters behind the verdict, then further details
ParameterMidiflow Motion (Audiobus)Nulltrack
Price$1.99 — better$7.99
Rating2.0 (1 ratings) — better—
Positive reviews40.0% of reviews100.0% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 11 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS10.2 — better17.0
Further details — not scored
Size5 MB17 MB
Age rating4+4+
DeveloperJohannes DoerrDECTET LLC

Customer experience

Midiflow Motion (Audiobus)

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews5 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

Nulltrack

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Midiflow Motion (Audiobus)

No in-app purchases

None

Nulltrack

No in-app purchases

Questions

Is Midiflow Motion (Audiobus) free?
Midiflow Motion (Audiobus) costs $1.99, with no in-app purchases.
Is Nulltrack free?
Nulltrack costs $7.99, with no in-app purchases.
Do Midiflow Motion (Audiobus) or Nulltrack have ads?
Neither Midiflow Motion (Audiobus) nor Nulltrack shows ads.
Which is updated more often, Midiflow Motion (Audiobus) or Nulltrack?
Midiflow Motion (Audiobus) ships an update every 11 months, and Nulltrack every 9 days. Most recently, Midiflow Motion (Audiobus) was updated on September 30, 2026 and Nulltrack on October 2, 2026.

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