A2M real-time Audio to MIDI 4+

AUv3 plugin and standalone app

Nilson Ltd.

    • 3.4 • 11 Ratings
    • Free
    • Offers In-App Purchases


Convert your audio source directly to MIDI.
Just play an instrument or hum and turn the melody into an instrument of your choice.
Get your ideas out fast and easily!

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.

The standalone version works with all MIDI-compatible applications, including GarageBand and Logic Pro.
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.
A2M works (though imperfectly) as an AU plugin in Logic Pro (see user guide).
A2M does not work as an AU plugin in GarageBand.

⁍ 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

• macOS 11 Big Sur 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!

What’s New

Version 1.1.0

Reference pitch settings from 400 to 480 Hz (the default is A₄ = 440 Hz)

Ratings and Reviews

3.4 out of 5
11 Ratings

11 Ratings

stenyxx ,

good product, but lacking some features

it works great for what it is, but I wish it would save my last-used settings, and if it would stay running in the background even if I close the window like other Mac apps do. It also would be nice if it tracked audio below E1, for when I'm playing a bass in drop D tuning.

gravytop ,

I like it, but I can’t figure out how to purchase it

I like this app a lot. It’s so straightforward and seems to work well. But I can’t figure out how to purchase it. There’s a restore purchase button but I can’t figure out how to pay it so it doesn’t shut off every few minutes.

Edit: thanks. I guess I am licensed, then. Cool.

Developer Response ,

There’s a shopping cart icon on the toolbar. If not, it means you have a full version.

----Ryan----- ,

This app is incredible

I can’t tell you how long I’ve waited for an app like this that works so well! It’s truly amazing!!! The tracking is so fast. To the developers- thank you so much! Please keep up this updated I can’t imagine playing without it. Well worth the $10 for unlimited use.

App Privacy

The developer, Nilson Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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