# Atom \| Piano Roll 2 — Sequencer and clip launcher

> Advanced AUv3 MIDI note editor, modular sequencer, and clip launcher for iOS music production. (iPhone/iPad app by Victor Porof.)

- Source: https://appshunter.io/ios/app/atom-piano-roll-2/id1536259776 (this page in markdown: same URL + `.md`)
- Developer: [Victor Porof](https://appshunter.io/developer/1446209018)
- Category: Music, Entertainment
- Price: $19.99
- Rating: 4.50/5 from 96 App Store ratings · 80 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.1 · 16 MB
- Languages: American English
- Released: 2021-03-15
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/atom-piano-roll-2/id1536259776/reviews.md

## What is Atom | Piano Roll 2?

Reached #1 on the App Store in the Top Paid Music App Category.

The most advanced AUv3 MIDI note editor, modular sequencer and clip launcher on iOS.

Notes:
- This plugin does not run as a standalone app and requires a compatible host.
- MIDI is not sound. To make sound you'll have to feed the MIDI into a synthesizer or instrument app. Bring your own synths!
- Hardware integration with controllers requires iCloud Drive.

Compatibility:
- Special integration with hosts: AUM and Drambo.
- Tested hosts: ApeMatrix, Audiobus, BeatMaker, Cubasis, MTS, Zenbeats. Limited support by NanoStudio 2. Not supported by GarageBand.

Build live sets for clip launching, or an entire track with unlimited length. Play the whole sequence, or adjust the loop markers to iterate over a single section. Step input, or record as played, all with perfect timing accuracy.

Write your own code, share it with the community! You can control hardware devices, adding support for new controllers or completely changing the behavior of existing ones. Build your own styling with custom layouts and themes. Change colors, fonts, sizes… make it yours!

Piano Roll 2 takes all the features you love about the first installment, and expands them into an entirely new breed of modular sequencer and clip launcher, unparalleled in flexibility and depth on iOS. We redesigned it from the ground up to incorporate a plethora of new features and workflows.
- It's a sequencer that augments the capabilities of your host or DAW.
- It's a composition tool that helps you to write beautiful melodies and complex polyrhythmic patterns.
- It's a clip launcher that integrates seamlessly with supported hardware controllers.
- It's a scripting playground that lets you customize your workflow with code.
- It's a swiss-army knife of possibilities when working with MIDI.

Here are just some of the many use cases this modular architecture supports: 
- Build live sets for clip launching.
- Compose patterns with touch, Apple Trackpad and Apple Pencil, or use the step input mode to write melodies step-by-step.
- Capture performances in real time and export your patterns as MIDI files.
- Import and edit MIDI files created in other apps, or from commercial packs.
- Record generated MIDI of other plugins or sequencers.
- Write harmonies and counterpoint melodies by superimposing the patterns of other Atoms as ghost lanes.
- Construct complex polyrhythms by taking advantage of custom time signatures and grid fractions.
- Sequence the sequencers for full modular mayhem.

## Key features

- AUv3 MIDI note editor
- Modular sequencer
- Clip launcher
- Step input and real-time recording
- Customizable layouts and themes
- Scripting for custom workflows
- Ghost lanes for harmonies and counterpoint

## What do users think of Atom | Piano Roll 2?

Overall sentiment: mixed

**Pros**

- 🎹 Excellent piano roll editor with intuitive interface
- 🎯 Powerful MIDI sequencing and clip launching capabilities
- 🔗 Great integration with AUM and hardware controllers like Launchpad
- ✨ Feature-rich with multiple layers, patterns, and flexible grid
- ⚡ Smooth and responsive performance
- 🎨 Well-designed UI packed with thoughtful details
- 📱 Works seamlessly with external MIDI controllers
- 🎼 Supports MPE MIDI recording and routing
- 💪 Capable of handling complex musical arrangements

**Cons**

- 🐛 Frequent crashes and stability issues in AUM
- 🖱️ No mouse/trackpad support for drawing notes
- 📝 Missing MIDI CC editing functionality
- 🎚️ Poor velocity editing workflow
- 👁️ UI elements too small and cramped
- ⚠️ Incompatible with Logic Pro for iPad
- 🔌 Launchpad Pro MK3 compatibility issues
- 📊 No parameter sequencing for AUV3 instruments
- 🎵 Note corruption and playback mismatches
- ⏸️ Cannot undo from MIDI controller
- 🚫 Lacks standalone mode functionality
- 📱 MacBook Pro compatibility listed but non-functional
- 🔄 Inconsistent developer support and updates

**Commonly reported bugs**

- Crashes when saving sessions in AUM
- Notes get corrupted during playback
- White background display issue
- Position indicator jumps when loop doesn't start at bar 1
- Buttons for adding bars disappear after certain point
- MIDI input processed incorrectly even in passthrough mode
- Notes don't play after being added to piano roll
- App doesn't appear in AU list on MacBook Pro
- Launchpad Pro MK3 session clip launch mode not working
- iOS 12 compatibility crashes
- Incompatibility with Cubasis 3 and GarageBand
- Responsiveness issues with Apple Pencil (resolved in updates)
- GUI rendering problems on some iPad models

**Most requested features**

- MIDI CC editing and visualization
- Mouse and trackpad input support
- Logic Pro for iPad support
- Chord entry in step input mode
- Velocity editing improvements and visual feedback
- Dark mode option
- Drag and drop from Suggester
- Time stretch/MIDI stretch functionality
- Standalone mode without requiring AUM
- Launchpad Pro MK3 full compatibility
- Grid-style interface similar to Launchpad
- Step input for multiple notes simultaneously
- Better zoom and selection for longer patterns
- Undo last recording feature
- Parameter automation curves
- Easier MIDI channel switching
- Tutorials and documentation

## Recent user reviews (10 of 80)

All indexed reviews: https://appshunter.io/ios/app/atom-piano-roll-2/id1536259776/reviews.md

### 3/5 — Midi CC editing ??

*2025-07-24*

It’s a decent app for what it does… however, it advertises itself as a, ‘Swiss army knife of midi’… It isn’t when you can’t edit basic midi CC data. This has been asked for a years it turns out and it looks like it’s been ignored by the developer. I’ll think twice before buying another from this developer.

### 2/5 — Notes get corrupted easily

*2024-12-04, version 2.0.10*

Not sure if this is an iOS 18 thing or not, but on my iPad I’m noting that even with very simple patterns, notes seem to get corrupted and when playing back don’t match what I have drawn on the grid. Kind of kills the whole value of this app for me.

### 4/5 — Great Plugin

*2024-10-19*

The UI is kind of tiny, but it's understandable because it's crammed with features.

The App Store on my M1 Mac says it is compatible with MacBook Pro, and it installs, but it's not really available in any useful way. It doesn't show up in the AU list.

Perhaps the app's listing could remove MBP compatibility from the page.

### 1/5 — Sad, and sorry for being a bit honest and truthful

*2024-08-08*

This app is soon gonna lost into the oblivion, Soon! My condolences. Just out of respect I’m giving 2 stars.
Update: 

Due to the  sheer negligence of the developers, and the fact that they don’t care or absolutely not bothered by the fact that a huge number of people have spent their money, which was earned by working hard and was earned through their sweat. 

This is simply an act of disrespect and utter insult to the people who put their trust on this dev. Which he certainly absolutely do not deserve.

If you’re going to do something, do it with integrity and dignity, if you’re not gonna work on this app, give it to someone else, there are a huge number of developers iOS can do wonders nowadays. 

But you’re not going to do that simply because you simply do not care and albeit an irresponsible developer.

Anyway, congratulations on your success of lowering down the standard of the AppStore, 

Similar apps like Xequence, Helium, Fl Studios Piano Roll, have surpassed this already.  Doesn’t even support drag and drop from Suggester , can you believe it? Let’s not go into the glitch details.

Stay well, and be blessed.

### 5/5 — Logic Pro iPad….

*2024-06-23, version 2.0.10*

Integration would be nice….
Pretty sure this shark is dead in the water by now.

### 5/5 — Please update

*2024-06-05, version 2.0.10*

Please update for Logic Pro for iPad

### 4/5 — Almost Perfect Midi Tool

*2024-05-11*

Atom2 is a good midi tool for working and performing with midi loops, however the amount of screen space taken by the multiple instance makes it awkward to use with more than five individual tracks on iPad unless your are fortunate enough to have a launchpad external controller. I feel for iPad use it needs a grid style interface in the style of a launchpad like the LK app has, if this was added or was part of an ATOM3 app it would be a 5 star app

### 4/5 — Doesn’t seem to support Launch Pad Pro MK3 anymore.

*2024-05-09*

I absolutely love this app and used it in AUM - launching clips with my Novation Launchpad X.  Having recently upgraded to the Launchpad Pro Mk3, I was expecting the Session view to work in the same way. Unfortunately, it doesn't enable the session ‘clip launch’ mode. It still works on the X, so Im wondering if it’s the latest firmware. I hope the Dev will take a look and see if theres anything that can be done.

### 2/5 — App perfect example of iOS music shortcomings

*2023-12-01*

This could have been a professional level app but the one man band developer pulled a disappearing act for the past two years and now this app is incompatible with current standards and newer apps such as Logic Pro for iPad. Nobody to turn to for support or updates. Increasingly obsolete. This is why anyone serious will stick with professional computers DAWs and iOS music apps will only ever be for hobbyist light recreation.

### 3/5 — Mouse support

*2023-07-05, version 2.0.10*

Please add support to be able to draw in your notes with trackpad or mouse, not everyone wants to use their fingers or can has an apple pencil.

## Frequently asked questions about Atom | Piano Roll 2

### What does Atom | Piano Roll 2 do?

Atom | Piano Roll 2 is an advanced AUv3 MIDI note editor, modular sequencer, and clip launcher for iOS. It allows users to create complex musical patterns, build live sets for clip launching, and compose entire tracks with unlimited length. It functions as a plugin within compatible music hosts.

### What are the key features of this app?

Key features include an AUv3 MIDI note editor, a modular sequencer, and a clip launcher. It supports step input and real-time recording with perfect timing accuracy. Users can also customize layouts and themes, write code for custom workflows, and utilize ghost lanes for harmonies and counterpoint.

### How much does Atom | Piano Roll 2 cost?

Atom | Piano Roll 2 is a paid application. The provided data indicates it was a #1 paid music app, suggesting a one-time purchase model without ongoing subscriptions or free-to-play mechanics.

### What devices and software is this app compatible with?

This app requires a compatible host application to run, as it does not function as a standalone app. It has special integration with AUM and Drambo, and has been tested with hosts like ApeMatrix, Audiobus, BeatMaker, Cubasis, MTS, and Zenbeats. Limited support is available for NanoStudio 2, and it is not supported by GarageBand.

### What are some common use cases for Atom | Piano Roll 2?

Common use cases include building live sets for clip launching, composing patterns with touch or step input, capturing performances, importing and editing MIDI files, and sequencing other sequencers for complex modular setups. It's also useful for writing harmonies, counterpoint melodies, and constructing complex polyrhythms.

## Version history (last 5 releases)

### 2.0.10 — 2021-05-29

- Infinite undo. Edit fearlessly.
- Improved channel targeting: long pressing a channel’s show/lock buttons will now toggle them exclusively, for easier channel switching.
- Improved interplay between user configurations and custom styles: now always using larger fonts when the selected configuration demands them. Configurations (such as Larger Controls and Sausage Fingers) support an "includedStyle" field which always applies the specified stylesheet. In effect, you can now use "Larger Controls" with "Larger Fonts" in combination with "MIDI Channel Colors".
- Added a "MIDI Note Data" example style that shows all note info, including the note’s octave, value, velocity etc.

Note: When iOS notifies Atom of system-wide memory pressure, very old undo/redo history will be discarded.

### 2.0.9 — 2021-05-15

*** 16 channels in one instance ***
- New: Added support for multi-channel workflows. Each instance can sequence 16 channels (or “tracks” in non-MPE modes) which can be routed to any number of instruments.
- New: Each channel can be individually enabled, shown/hidden, or locked/unlocked (ghosted). Multiple channels can be shown and edited at the same time! Hidden or locked (ghosted) MIDI channels don't participate in new selections, processing operations such as quantize etc.
- Improved: The default multi-channel mode ("MPE") will now enable all channels by default. The newly added “Filter" mode works like MPE, but allows manual enabling/disabling of individual channels. The improved "Funnel" mode will funnel/copy all MIDI events into the selected channels and is useful for “faking MPE” with certain instruments.
- Improved: All channel focus/lock operations will now automatically update note entry settings. Manually inputting notes will respect the targeted channel, shown in the top-left. All note entry settings can still be customized by long pressing the “Add” button.
- Improved: The Magic Clipboard will now paste on the first "targeted" channel, shown in the top left. Long pressing the paste buttons will paste preserving the original channels, for more advanced use-cases.

Tips: 
- You can use the "MIDI Channel Colors" theme when working with multiple channels in a single instance.
- Make sure your keyboard or MIDI source emits on the right channel. Atom 2 records everything exactly as received.

*** More automation and multi-take recording features ***
- Exposed an 'Add Empty Pattern' parameter to complement the existing 'Duplicate Pattern' and 'Clear Pattern' parameters for external control. Map them to a Note, CC or PC message using your host’s MIDI learn features. Now you can create a new take in your recording as a persistent pattern with just a single MIDI message.
- Added a more spontaneous way of arming recording on supported controllers: the global arm record button ("Capture MIDI") on the Launchpad X and Pro Mk3 will now arm/disarm the focused (visible) clips, no matter which mode the controller is in (e.g. arm the visible clip while in Note or Chord mode). The top-right logo on Launchpad controllers now will also illuminate with the color of the most recently focused (visible) clip.
- Added an easier way of controlling automation endpoints: with a simple “snapback automation” setting, enabled by default and available in the advanced launch settings, automation snaps back to its home value at each loop start. This makes recording automation such as a filter sweeps or crescendo modulations a lot easier. The home value is always set to the earliest value in the sequence.

*** Other new features and tweaks ***
- New: A new way of switching between note entry and note selections: on the Apple Pencil 2, double tapping will switch between the two input modes.
- New: Added an in-app toggle for switching dark mode on/off.
- New: Added an in-app toggle for disabling animations.
- New: Improved or changed various icons across the UI.
- New: When “loop” is off, clips will now automatically un-launch when reaching the end marker.
- Fixed: CC and aftertouch events are now properly funneled in thru mode when MPE is disabled.
- Fixed: Performance improvements when working with very long clips.
- Scripting: All MIDI callbacks in the scripting sandbox will now include the port info as the last argument.
- Scripting: Exposed `addEmptyActivePattern`, `armScene`, `getAllFocusedClips`, `hasFocusedClips`, `getAllRecordingTracks`, `hasRecordingTracks` methods to the scripting sandbox.

### 2.0.8 — 2021-05-04

- Full MPE and automation support for MIDI import/export, in addition to recording. Working directly with MIDI files will now include pitch bend, modulation, sustain and all other CC or aftertouch events.
- Full MPE compatibility for Linnstrument and Continuumini hardware.
- Greatly improved performance on all devices when recording MPE that generates a lot of data.

### 2.0.7 — 2021-05-02

*** MPE and automation ***
- Added support for MPE recording. All new clips will have MPE enabled by default, no configuration required!
- Added support for pitch bend, modulation, sustain, and “black box” automation recording. Each pattern has its own dedicated automation group, which includes all event lanes.
- Added “Multi-Channel” support: each note, in each pattern, in each clip, can have its own dedicated MIDI channel. Each clip can be configured to output in “filter” or “funnel” mode.
- Recording will honor the MIDI channels for incoming MIDI events.
- Note entry will honor the MIDI channel and velocity settings specified in the new “Advanced Add” panel.
- Included a “MIDI Channel Colors” style: enable it to colorize notes based on their individual channels.

Note: To turn on MPE for clips created in previous versions, enable “MPE” and “tick all” channels from the Output toolbar.

*** New features ***
- MIDI import is now non-destructive: all other patterns, settings, and history will be preserved in the current clip, and only new patterns will be added for each lane in the MIDI file. Each pattern has its own grid, time signature, bar count and loop makers.
- Scales can be fuzzy-filtered. Search for scales by their name, mode, or notes. Bad spelling works too.
- Patterns can now also be switched with CC values. Map patterns to a rotary encoder (knob) on your controller, in any host.

*** Tweaks and fixes ***
- Added: Playhead position will now be remembered in the history stack. Useful when undoing step-input.
- Added: All the non-destructive processes now have toggles for snapping the effect strength.
- Added: Configurations now include preferred styles. E.g. setting "Larger Controls" will now apply the appropriate fonts by default (but still overridable).
- Added: Logs will include messages about which ports are disconnected.
- Fixed an unintuitive off-by-one situation when launching patterns with velocity.
- Fixed an issue where recording wouldn't work as expected with MIDI generated from audio units which sometimes never off'ed notes (e.g. Autony).
- Fixed an issue where the "paste at playhead" button for the first snippet wasn't tappable.
- Fixed an issue where the UI remain stuck in a perpetual loading state.
- Fixed an issue where the UI would freeze for a second when refocusing, if patterns were frequently switched while the view was in the background.
- Improved: The total memory usage is now down to ~90mb per 512 instances.
- Improved: MIDI files with incorrect file extensions can now also be imported.

### 2.0.6 — 2021-04-22

*** Overhauled Patterns ***
- You can now use just a single instance to build all of your clips on a single track.
- Added the ability to switch patterns using notes, CCs, PCs and even velocity, on any channel. Playback uses immediate-gate mode.
- Added switch with legato for patterns. Switching between patterns will now let the notes naturally ring, so the changes aren’t abrupt.
- Decoupled pattern editing from playback: patterns can now be edited while other patterns are playing.
- Added 'Focus' and 'Play' buttons beside each pattern thumbnail.

*** Drambo integration ***
- The most advanced modular sequencer befriends the most advanced modular host.
- Atom patterns will now follow Drambo patterns, synced to quantum.
- Clips will now auto-launch when instantiated in Drambo.

*** New features ***
- MIDI export will now export all patterns on separate channels.
- Implemented crop to loop, crop to notes and crop to selection.
- Added 16 new scales: all Modal Hexatonic variants (6 modes), Hirajoshi (5 modes) and Kumoi (5 modes). Give Hirajoshi a try, it’s awesome.
- Added “Auto Swing Duration” in the swing processing toolbar. When on, swing timing strength will automatically set swing durations.
- Made the tempo slider snap in increments of 0.05 when dragging. Adjustments are in 0.01 increments when tapping. 
- Made the tempo parameter go down to 0 (it was 0.5 minimum previously).
- The “Play pattern" parameter, as well as the "Clear active"/ "Duplicate active" pattern parameters, now all work with Launchpad controllers even when the instance itself isn't focused (visible).

*** UI tweaks ***
- Bars now alternate their background color in the grid.
- The focused pattern number is now displayed above the keyboard. The playing pattern number is now shown in the Clip button.
- The grid and time panels are now persisted; this allows changing snap and grid settings during note entry.
- Scales, Layers, Clipboard and Pattern controls will now always stay in view when scrolling.
- Double tapping a pattern thumbnail will now select all notes in that pattern.
- Increased the touch area for the note resize grabbies.
- Relocated the Listen button to the bottom-left.
- Changed the long-press indicator style for buttons with hidden menus.
- Fixed playhead position not updating with undo/redo.
- Fixed playhead position not visually seeking forward with step input.
- Many layout improvements, especially for iPhone when used in vertical mode.

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## More apps by Victor Porof

- [MIDI Tools](https://appshunter.io/ios/app/midi-tools/id1446209019)

All apps by Victor Porof: https://appshunter.io/developer/1446209018

## Related topics

[sequencer rack 2](https://appshunter.io/ios/topics/sequencer-rack-2)

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*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 2026-08-30.*