# OODA — Portable MIDI Sequencer — Step sequencer with wormholes > Interactive MIDI step sequencer with conditional wormholes and decoupled voice models. (iPhone/iPad app by Ryan Robinson.) - Source: https://appshunter.io/ios/app/ooda-portable-midi-sequencer/id1612549576 (this page in markdown: same URL + `.md`) - Developer: [Ryan Robinson](https://appshunter.io/developer/1270890717) - Category: Music - Price: $8.99 - Rating: 4.80/5 from 38 App Store ratings · 22 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 11 MB - Languages: American English - Released: 2022-04-28 - Data updated: 2026-08-27 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/ooda-portable-midi-sequencer/id1612549576/reviews.md ## What is OODA? OODA is a fresh take on the classic MIDI step sequencer with interactive and semi-generative enhancements. What makes OODA unique is that you can connect arbitrary steps together using conditional “wormholes” to add structured (or random) variation to your sequences. Another unique feature is that OODA’s underlying model is decoupled from its voices. This allows you to interact with your sequences and create melodic variations in real time without affecting your groove. OODA’s open-ended sequence grid can be easily configured for almost any use case. Anything from simple melodies and bass parts to semi-generative chords and arpeggios, OODA can do it all with a little creativity! Features: - Record sequences up to 64 steps with the in-app keyboard or an external MIDI device - Interact with your sequence on the fly using four “action” buttons - Link together steps using conditional wormholes to create structure and variation - Create complex patterns of melody and rhythm using four independent voices - Change voice speed independent of sequencer speed - Comes with ten factory presets to give you an idea of what OODA is capable of - Explore a deep, yet focused set of parameters - Sequencer Settings - Grid size (4x4 or 8x8) - Sync voices to sequencer rate - Sequencer rate - Sequencer direction - Shift amount (semitones) - Live toggle rests and skips - Wormhole Patcher - Conditionally “reroute” your sequence by connecting arbitrary steps - Per-step wormholes - Destination and normal steps per wormhole - Trig conditions and probability for moving through each wormhole (see below for list) - Voice Settings - Four voices with independent settings - Enable/disable - Rate of play (in beat time from 16 bars to 32nd T) - Includes unique note values based on the Golden Ratio for maximum generative fun! - Length of note (10% to 100%) - Variety of rules for selecting notes from active step (see below for list) - Pitch offset - Unique pattern control for creating rhythms and polymeters, now with step options - Easily add holds, ties, accents (positive and negative), ratchets, and trig conditions - MIDI velocity and channel - Flexible Connectivity - Use in a compatible audio unit host like AUM, or in standalone mode - Control multiple instruments at once with five MIDI outputs - One for all voices together, and one for each voice by itself - Sync to the tempo of other devices using Ableton Link or MIDI clock (standalone) - Send MIDI clock to external synths (standalone, experimental feature) - Connect to Bluetooth MIDI devices - Modulate OODA’s parameters in a compatible AUv3 host (audio unit) - Eight unique MIDI CC outputs derived from OODA’s sequencer model - Sequencer X, Sequencer Y, Sequence Phase, Action OR, and per-voice random - Includes macOS app! IMPORTANT: OODA can be used as a standalone app or as an AUv3 plugin. There are some important differences between the two. The standalone app features a simple, toggleable "Sidekick Synth" so you can quickly experiment with OODA. Of course, you can also send MIDI from the standalone app. Meanwhile, the OODA AUv3 plugin does NOT generate sound. Instead, you use it to send MIDI (note messages) to other apps, plugins, or hardware instruments that do the actual sound generation. AUv3 plugins must be used inside a compatible host. Available Wormhole Rules - Always, 1x through 7x, 2:2 through 8:8, 10%, 25%, 33%, 50%, 67%, 75%, 90%, Last, Not Last Available Voice Rules - Nth, Lowest, Highest, Random, Up, Down, UpDown, DownUp, UpDown+, DownUp+, Rise, Fall View manual: https://www.audiosymmetric.com/manuals.html View tutorials: https://www.youtube.com/channel/UC9Uka-nFom-pgTB-DftgDvA ## Key features - Record sequences up to 64 steps - Interactive step sequencing with wormholes - Four independent voices with customizable settings - Real-time melodic variation control - Flexible grid configuration - Standalone and AUv3 host compatibility - MIDI clock sync and output ## Chart rankings - #168 in Top Paid · Music (US App Store) ## Recent user reviews (10 of 22) All indexed reviews: https://appshunter.io/ios/app/ooda-portable-midi-sequencer/id1612549576/reviews.md ### 5/5 — Very Inspiring! *2026-01-02* Great fun right from the start and as deep as you want it to be once you’ve got your head around all the possibilities. Can I make one request, though; could you make it possible for the four voices to start at different points and move at different speeds and directions, please? Then it would be perfect. ### 5/5 — Wow OODA *2024-03-26* I like that you can sequence up to 4 voices and time shift each individual voice.. nice interface and lots more! Does it need a scaler though? ### 5/5 — Deep and fun! *2023-10-05* By far my favorite sequencer. The voice panel, and the fact that it is separated from the steps is very powerful. Be sure to check out the tutorials on YouTube. Two improvements I’d love to see: — copy/paste of steps — and maybe an option to see which notes have been recorded into each step **Developer response:** Thanks for the kind review! Will keep the suggestions in mind for a future update. ### 5/5 — Deep and fun! *2023-10-02* Wow! By far my favorite sequencer. The Voice panel, and the fact that it is separated from the steps is very powerful. The UI is set up thoughtfully and very easy to master. So good, and easy to get lost for hours in it. Be sure to check out the tutorials on YouTube. If anything, sometimes I’d love to have an option to see which notes have been recorded into each step. But maybe this would make things too convoluted, idk. The current balance between complexity and simplicity is perfect. ### 5/5 — Another Creative Tool! *2022-09-07* This developer’s apps are fantastic. Very inspiring creative tool. Creates evolving patterns. Really fun to use as a discovery tool. **Developer response:** Thanks so much. Glad you're liking OODA! ### 5/5 — So much fun! *2022-09-07, version 1.0.1* Thank you Ryan. This midi sequencer is really fun with a lot of options. I already have a lot of midi sequencers but this one is different. Fun, intuitive + we always can watch your tutorials on YouTube if we want to dive deep into the sequencer. I do not use all the options, but it well worth my money only for the options I use. Works A++ in AUM. Are you working on a new app? Great job! ### 3/5 — Preview, See and Edit Notes in Steps *2022-09-07* Is it possible to press each step in the sequence or to play the steps manually? Also, when we press each step, can we see the notes on the keyboard and edit the notes. The preview is really important if we want to hear and modify a step. **Developer response:** Thanks for the review. While the sequencer is running, you can tap on a step and then that step will be the one that plays next. OODA is designed to feel a bit like a hardware sequencer so you are not able to see or edit the notes without recording them again. That being said, this is a very commonly requested feature, so it's definitely something I'll keep in mind for the future. ### 5/5 — Ooda is something special *2022-08-08* there are now a lot of such midi tools. Ooda is highly recommended. there is so much to discover, so many surprises, so much to learn and experiment. and so much fun... **Developer response:** Thanks for the kind words! Glad you're enjoying OODA. ### 1/5 — Garbage *2022-06-13, version 1.0.1* I want my money back. The sequencer is a joke. ### 5/5 — Great sequencer with a rare feature: Step recording! *2022-06-10* I love “Berlin School” type sequencing - mostly on hardware synths. Today I would say that this is the ideal app. On one hand feature rich, on the other not too complicated and a very clean UI. Ideal for jamming. Having proper step recording is a BIG bonus for people like myself, who don’t like fiddling with piano rolls or sequencer sliders, and who are not born piano players. Song mode or the ability to cue various patterns would be a great feature. **Developer response:** Thanks for the kind review and the ideas! ## Frequently asked questions about OODA ### What is OODA? OODA is a MIDI step sequencer that introduces interactive and semi-generative features. It allows users to connect arbitrary steps using conditional 'wormholes' for structured variation and create melodic variations in real-time. The app's model is decoupled from its voices, offering unique creative possibilities. ### What are the key features of OODA? Key features include recording sequences up to 64 steps, using conditional wormholes to link steps for variation, creating complex patterns with four independent voices, and real-time interaction with sequences via action buttons. It also offers flexible parameter control for sequencers, wormholes, and voices, along with robust MIDI connectivity. ### How much does OODA cost? Based on the provided information, OODA is a paid application. There are no mentions of free trials, subscriptions, or in-app purchases for additional features or content. ### What devices is OODA compatible with? OODA can be used in standalone mode or within a compatible Audio Unit host like AUM. It supports external MIDI devices for recording and can sync with other devices using Ableton Link or MIDI clock. It also connects to Bluetooth MIDI devices. ### What are some common use cases for OODA? OODA is versatile and can be used for creating simple melodies and bass parts, complex semi-generative chords and arpeggios, and intricate rhythmic patterns. Its flexible grid and voice settings allow for a wide range of musical experimentation, from basic sequencing to advanced generative composition. ## Version history (last 3 releases) ### 1.1 — 2022-12-08 New in OODA 1.1: - Share your user presets with friends and other devices using AirDrop! - Refactor sequencer engine for better accuracy, stability, and to eliminate hung notes. - The standalone now restores your last recorded sequence across launches. - Add double-tap action to gate length slider to restore default value. - Add right-click alternatives for gesture-based actions on macOS. ### 1.0.1 — 2022-06-07 New in OODA 1.0.1: - Fix an issue where ratchets would sometimes cause hanging notes. - Fix some issues causing hanging notes in Cubasis. - Make sure OODA always receives MIDI on its virtual input port. - Small UI changes for consistency with ZOA. - Fix an issue with some parameter menus controlling the wrong AU parameters on macOS. - Prevent redundant Note Off events from advancing the active record step. - Potentially fix an issue that caused OODA to crash on launch on macOS Catalina. ### 1.0 — 2022-04-28 No release notes. ## Apps similar to OODA | App | Rating | Price | Category | | --- | --- | --- | --- | | [Been Getting Fetty Radio](https://appshunter.io/ios/app/been-getting-fetty-radio/id6450182020) | 5.0 (4) | Free | Music | | [OUT & PROUD LIVE](https://appshunter.io/ios/app/out-and-proud-live/id1562328760) | 5.0 (8) | Free | Music | | [Silo - Granulator and Reverb](https://appshunter.io/ios/app/silo-granulator-and-reverb/id6444164740) | 4.8 (32) | $9.99 | Music | | [Radio 105 Indie](https://appshunter.io/ios/app/radio-105-indie/id1559928660) | — | Free | Music | | [Real Piano - Electric Keyboard](https://appshunter.io/ios/app/real-piano-electric-keyboard/id6446647820) | 1.0 (1) | Free | Music | | [MusicPutty - Vocal Tune](https://appshunter.io/ios/app/musicputty-vocal-tune/id6444390100) | 4.3 (127) | Free | Music | ## More apps by Ryan Robinson - [AutoPad — Ambient Pad Loops](https://appshunter.io/ios/app/autopad-ambient-pad-loops/id1270890718) - [SDS-x — Simple Drum Sampler](https://appshunter.io/ios/app/sds-x-simple-drum-sampler/id1468026221) - [ZOA — Living MIDI Sequencer](https://appshunter.io/ios/app/zoa-living-midi-sequencer/id1581881354) - [Mix Stream — Audio to Phone](https://appshunter.io/ios/app/mix-stream-audio-to-phone/id6761495547) All apps by Ryan Robinson: https://appshunter.io/developer/1270890717 ## Related topics [chordbud 2 auv3 midi sequencer](https://appshunter.io/ios/topics/chordbud-2-auv3-midi-sequencer) · [prism midi sequencer](https://appshunter.io/ios/topics/prism-midi-sequencer) --- *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 2026-08-27.*