# A2M real-time Audio to MIDI — AUv3 plugin and standalone app > Real-time audio pitch detection and conversion to MIDI notes. (iPhone/iPad app by Nilson Ltd..) - Source: https://appshunter.io/ios/app/a2m-real-time-audio-to-midi/id1569569145 (this page in markdown: same URL + `.md`) - Developer: [Nilson Ltd.](https://appshunter.io/developer/1231836945) - Category: Music, Music, Entertainment - Price: Free with in-app purchases - Rating: 3.82/5 from 28 App Store ratings · 35 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 3 MB - Languages: English - Released: 2021-07-21 - Data updated: 2026-06-10 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/a2m-real-time-audio-to-midi/id1569569145/reviews.md ## What is A2M real? A2M detects the pitch of the audio and converts it into the corresponding MIDI notes in real time. Thanks to this, you can play, e.g., the guitar, saxophone, or even sing, and simultaneously trigger sounds in virtual instruments (not only AU). These acoustic (or electric) instruments, or your voice, act as a MIDI controller. A2M comes as an AUv3 plugin and as a standalone application (which is the AU host for this particular plugin). The A2M is quite an unusual Audio Unit – it is both an audio effect and a MIDI effect. Due to its characteristics, it is something in between. On the one hand, it analyzes the input sound, just like any audio effect. On the other hand, it generates output MIDI events, just like any MIDI effect. AU Hosts compatible with A2M Audio Unit: • Audiobus • AUM • apeMatrix A2M does not work as an AU plugin in GarageBand. The standalone version works with all MIDI-compatible applications, including GarageBand. The app sends MIDI events via the virtual MIDI port. The list of active and inactive MIDI ports is available in the application settings in the MIDI Settings → Outputs section. Parameters ⁍ Host ▸ Audio input buffer size The smaller the buffer, the higher the CPU load and the lower the latency. A buffer less than 512 should only be set if you have a strong processor. For A2M standalone applications, the buffer size is available in the application settings under Audio Settings → Buffer Size ⁍ Plugin ▸ Pitch recognition method A2M offers two popular algorithms: • Based on autocorrelation, the beat bars proprietary method • FFT (with parabolic interpolation) ▸ Gate Threshold and Input Gain A2M works best when it only recognizes sounds at an appropriate volume level. In order to eliminate unnecessary background noises, select the appropriate value. ▸ Latency / Accuracy 2 dashes (default) – the best compromise between accuracy and latency. The higher the accuracy, the more of the CPU’s capacity is used and the longer the latency (as opposed to the audio buffer size settings). ▸ Velocity Gain It allows you to select the appropriate volume of the virtual instrument itself. Known limitations in the current version: • No polyphony • No pitch bending Requirements: • iOS 14 or later A2M - Audio to MIDI AUv3 • Live conversion • Two popular algorithms • Latency under control • Exceptionally accurate tracking • Simple to set up and use • Unique and innovative Try an unconventional way of creating music. It’s surprisingly easy! ## Key features - Real-time audio to MIDI conversion - Use instruments/voice as MIDI controller - AUv3 plugin and standalone app - Two pitch recognition algorithms - Adjustable latency and accuracy - Gate threshold and input gain control ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Remove Time Limit | $9.99 | one-time | ## Recent user reviews (10 of 35) All indexed reviews: https://appshunter.io/ios/app/a2m-real-time-audio-to-midi/id1569569145/reviews.md ### 3/5 — Useful but unreliable *2025-09-26* I want to like this app - the need for such is self-apparent. But it’s just plain unreliable and jittery, and the time-locked experiences I have with the free version don’t make me want to plunk down $10 for more of the same. Would buy if improvements to detection algorithm and output data streams were made. ### 1/5 — No midi meter movement *2025-09-16* I do not get meter movement on the output side.Please help ### 5/5 — An amazing real time audio to midi tool! *2025-08-21* I needed to feed a midi converted pitches from my woodwind in order to feed a visualizer. This is straight forward, took me less then 5 minutes to configure everything and accuracy is very good! I used a small condenser microphone that fed input in A2M. In Ableton Live I just used provided virtual midi port and it works! These audio to midi tools aren’t widely available, but this one gets the job done! Thank you!!!! Other one I was trying was Doubler 2 but that is designed for a voice and on a woodwind it was making mistakes. ### 2/5 — Good idea *2025-01-11, version 1.1.0* Like the concept but frankly I have found it rarely produces good quality translation of audio into midi even with simple input such as pads. With more complicated material I have never produced good quality midi . The app needs a further round of development ment in my opinion ### 1/5 — Not readable *2024-11-02* How do I even use this? I can’t even create a new track. I don’t get how this works at all. Until I can use it properly, I’m keeping this review at 1 star. Also the website doesn’t help ### 1/5 — Annoying *2024-10-20, version 1.1.0* Trying to figure out in 4 minutes ‘trial period’ how to connect this up, and whether it actually works is an absurd idea Are we meant to just get irritated and buy it so we can actually try the thing out or what ? ### 5/5 — best *2024-09-17* awwwwwwesome ### 3/5 — Hm…ok *2024-07-01* It Works but for that Price a Bit of correction and maybe some scales to choose would make it interesting. For Voice its very Hard and retriggers the Sounds often, so Short Sounds is Not really possible to send midi to. Using it with instruments that are keycorrect maybe works better. Also it Crashs allways when i try to Improve the quality I Hope it gets improved, ThumbJam did Great in that but i cant implement it as its iaa and Not auv3 ### 3/5 — Great but… *2024-05-28* The app is simple and doing its job fine. Slow tracking and the pitch recognition is good. But on my iPad Air gen4 OS 16 in AUM it crashes every 5 minutes. Pretty annoying and almost useless . It doesn’t look like, that the developer is working on it to improve it. ### 1/5 — Expensive and does not work in Logic for IPad *2024-04-22, version 1.1.0* I bought this hoping it would help me track basslines from Audio to MIDI but it simply does not work. DO NOT WASTE YOUR MONEY! Not sure if I can get a refund. I have been fiddling with it hoping to get it working for too long. Total waste of time. ## Frequently asked questions about A2M real ### What does the A2M app do? This app detects the pitch of incoming audio, such as from a guitar, saxophone, or voice, and converts it into corresponding MIDI notes in real time. This allows you to use your acoustic instruments or voice as a MIDI controller to trigger sounds in virtual instruments. ### What are the key features of A2M? Key features include real-time audio to MIDI conversion, the ability to use instruments or voice as a MIDI controller, availability as an AUv3 plugin and standalone app, two pitch recognition algorithms, and adjustable latency/accuracy settings. ### Is A2M free to use? The application is free to download and use, but it offers in-app purchases. Specific details about what these purchases unlock are not provided in the description. ### What devices and operating systems are compatible with A2M? The app requires iOS 14 or later. It functions as an AUv3 plugin in compatible hosts like Audiobus, AUM, and apeMatrix. The standalone version works with all MIDI-compatible applications, including GarageBand. ### What are common use cases for this app? A common use case is to play a guitar, saxophone, or sing and simultaneously trigger sounds in virtual instruments. It allows for an unconventional way of creating music by turning acoustic performances into MIDI data. ## Version history (last 5 releases) ### 1.1.0 — 2022-09-03 Reference pitch settings from 400 to 480 Hz (the default is A₄ = 440 Hz) ### 1.0.3 — 2021-10-24 Fixed bugs: • crash on changing the Latency/Accuracy slider • incorrect audio buffer duration shown in settings (standalone app) ### 1.0.2 — 2021-07-29 • Bug fix related to displaying a light background when the increased contrast option is turned on in dark mode. ### 1.0.1 — 2021-07-28 • Minor UI adjustments and performance improvements. ### 1.0.0 — 2021-07-22 No release notes. ## Apps similar to A2M real | App | Rating | Price | Category | | --- | --- | --- | --- | | [KODAI - Audio to midi](https://appshunter.io/ios/app/kodai-audio-to-midi/id1518032115) | — | Free | Music | | [Respiro wind-synth](https://appshunter.io/ios/app/respiro-wind-synth/id1537945616) | 4.6 (18) | Free | Music | | [Flux Mini](https://appshunter.io/ios/app/flux-mini/id1548927370) | 4.6 (40) | Free | Music | | [Tape Cassette 2](https://appshunter.io/ios/app/tape-cassette-2/id1507434173) | 4.7 (41) | Free | Music | | [Bull Deluxe Amplifier](https://appshunter.io/ios/app/bull-deluxe-amplifier/id1564285804) | 5.0 (5) | Free | Music | | [Roast Beef](https://appshunter.io/ios/app/roast-beef/id6444763159) | 4.8 (14) | $0.99 | Music | ## More apps by Nilson Ltd. - [MIDI Mouth Controller](https://appshunter.io/ios/app/midi-mouth-controller/id1447471921) - [MIDI Expression Pedal](https://appshunter.io/ios/app/midi-expression-pedal/id1527452076) - [MIDI Footswitch](https://appshunter.io/ios/app/midi-footswitch/id1527452822) - [MIDI Hand Controller](https://appshunter.io/ios/app/midi-hand-controller/id1527453317) - [Transposable Chromatic Tuner](https://appshunter.io/ios/app/transposable-chromatic-tuner/id1638770215) All apps by Nilson Ltd.: https://appshunter.io/developer/1231836945 --- *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 2026-06-10.*