# 303 Note - Acid Sequencer — tb-303 sheets > App for creating and managing acid bassline synth sequences with playback and tone control. (iPhone/iPad app by tsubasa hattori.) - Source: https://appshunter.io/ios/app/303-note-acid-sequencer/id1501084395 (this page in markdown: same URL + `.md`) - Developer: [tsubasa hattori](https://appshunter.io/developer/1501084394) - Category: Lifestyle, Music - Price: Free - Rating: 4.70/5 from 3 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 18.6 · 23 MB - Languages: American English, Japanese - Released: 2020-03-04 - Data updated: 2026-08-19 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/303-note-acid-sequencer/id1501084395/reviews.md ## What is 303 Note? TB-303 note is an app for quickly jotting down and managing acid bass line synth sequences — TB-303, Behringer TD-3, Roland TB-03, and more. Perfect for those moments when: "I want to recreate this pattern on another machine, but checking all the original settings is a hassle..." "My hardware's memory is full, but I don't want to lose my favorite patterns." Patterns you save can be played back instantly. Turn the built-in synth knobs to dial in that signature squelch while you shape your line. Key Features: - A dedicated interface: A step sequencer screen that feels just like the real hardware. Note, Down/Up, Accent, and Slide — all editable on one screen. - Built-in preview playback: Audition your patterns instantly, even while editing, so you can hear it and tweak it on the fly. - TB-303-style tone knobs: CUTOFF / RESO / ENV / DECAY / ACCENT — dial in the feel before you commit it to hardware. - Dark mode support: Easy on the eyes during late-night studio sessions or on a dark club stage. - CSV export: Export your saved patterns as CSV for easy backup and management on your computer. Keep your acid basslines safe and ready, anytime, anywhere. ## Key features - Step sequencer interface - Instant pattern playback - TB-303 style tone knobs - CSV pattern export - Dark mode support ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/303-note-acid-sequencer/id1501084395/reviews.md ### 5/5 — Cool app *2026-07-21* Seems to work well and easily understandable if you understand the 303 sequencer. Would love to see a random sequence function and ability to sequence less than 16 steps. ## Frequently asked questions about 303 Note ### What is 303 Note used for? 303 Note is an application designed for quickly jotting down, managing, and playing back acid bassline synth sequences, inspired by the TB-303 synthesizer. It allows users to save patterns and adjust the sound using built-in synth knobs. ### Does 303 Note have ads? No, 303 Note does not contain advertisements. It is a completely free application with no ads to interrupt your creative process. ### How does 303 Note's sequencer work? The app features a dedicated step sequencer screen that mimics the feel of the original hardware. Users can edit Note, Down/Up, Accent, and Slide parameters directly on this screen. ### Can I export my patterns from 303 Note? Yes, 303 Note supports CSV export for your saved patterns. This feature allows for easy backup and management of your sequences on a computer. ### What kind of tone controls does 303 Note offer? 303 Note includes TB-303-style tone knobs for shaping your basslines. You can adjust CUTOFF, RESO, ENV, DECAY, and ACCENT to dial in the desired squelchy sound before committing patterns. ### Is 303 Note available on multiple devices? Currently, 303 Note is supported on iPhone devices. Information regarding availability on other platforms like Android or tablets is not provided. ### How often is 303 Note updated? The latest version of 303 Note is 2.0.0, which was last updated on July 5, 2026. This indicates a recent update, suggesting ongoing development and support. ### What is the age rating for 303 Note? 303 Note has an age rating of 4+. This means it is suitable for users aged four and older, indicating no mature content. ## Version history (last 5 releases) ### 2.2.0 — 2026-08-13 MIDI export is here. - Export your patterns as MIDI files. Drop them into GarageBand, Logic, Ableton Live or any other DAW and keep working on your track. Accents and slides come along too. - Sort right from the pattern list. Tap the button in the bottom right to switch between name, date and favorites. - Per-pattern actions in one place. Tap "..." on any row to export or delete it. - Tempo and sound settings (cutoff, resonance, envelope, decay, accent) are now saved with each pattern, so it sounds the same next time you open it. Thanks for using the app! ### 2.1.1 — 2026-07-19 Bug fixes: ・Fixed an issue where the first playback after launching the app could produce no sound. ・Fixed an issue where adjusting the sound knobs could unintentionally move the screen. ### 2.1.0 — 2026-07-12 • Improved CSV export: Accent and Slide are now exported as separate rows, matching the layout of the editing screen. Your exported data is easier to read and work with. Thanks for using 303 note! We'd love to hear your feedback. ### 2.0.0 — 2026-07-05 Reworked editing screen. You can now play back your patterns instantly to check them as you go. New TB-303-style tone knobs (CUTOFF / RESO / ENV / DECAY / ACCENT) let you fine-tune the sound right on the spot, and you can keep editing while playback continues — making it faster than ever to hear it and fix it. We've also refined the control layout and given the app icon a fresh new look, along with various bug fixes and stability improvements. ### 1.2.0 — 2026-06-28 - Revamped the UI of the list screen. - Added a feature to mark notes as favorites on the list screen. ## Apps similar to 303 Note | App | Rating | Price | Category | | --- | --- | --- | --- | | [GlobalPoint Real Estate](https://appshunter.io/ios/app/globalpoint-real-estate/id1374798748) | 5.0 (1) | Free | Lifestyle | | [Monument Global Estates](https://appshunter.io/ios/app/monument-global-estates/id6584514191) | 5.0 (1) | Free | Lifestyle | | [HealthyLungs : Quite Smoking](https://appshunter.io/ios/app/healthylungs-quite-smoking/id6753585642) | — | Free | Lifestyle | | [nanolog (ナノログ)](https://appshunter.io/ios/app/nanolog/id1632839180) | — | Free | Lifestyle | | [Eclat～エクラ～公式アプリ](https://appshunter.io/ios/app/eclat/id1599999203) | — | Free | Lifestyle | | [KALKUL](https://appshunter.io/ios/app/kalkul/id6636494668) | — | Free | Lifestyle | ## More apps by tsubasa hattori - [ST-FrameViewer](https://appshunter.io/ios/app/st-frameviewer/id6758582276) - [Six-O](https://appshunter.io/ios/app/six-o/id6759165362) - [ぴたどり - 同じ構図で毎日の変化を記録](https://appshunter.io/ios/app/id6791220378) All apps by tsubasa hattori: https://appshunter.io/developer/1501084394 ## Related topics [sequencer](https://appshunter.io/ios/topics/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 2026-08-19.*