XII, an Experimental AudioVision App, performances ,in real-time, 3D computer graphics --animations visualized by audio-- and music based on Twelve-tone technique, running on both iPhones and iPads.

Note: The music in XII is not pleasing to the ears !!!

XII would lean towards automatic composition and music generated automatically. XII, therefore, offers few interfaces for users. Although, XII still provides you with sequence setup UI by which you are able to set the sequence of Twelve-tone.

One way to associate with your works is to send midi notes from the App to your hosts, such as DAWs, via wifi midi supported in XII.

This version performances with piano sound.

The system inside XII automatically calculates the fundamental elements of music, including octave notes, duration, velocity, polyphony, tempo, structure and expression, all of which ,except the sequence, are always generated and never repeated. Please note that all of these features and functions are in the hidden layers.

There are two kinds of sequencer orders under the system, forward and reverse.

Notes produced by your taps.
3D graphic rotated by your gestures.

-real-time calculation on both animation and music
-sequence setup.
-background audio.
-wifi-midi feature supported.

What’s New

Version 3.5

a new scene added

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Oceans in space ,

Pretty amazing

On iphone xs! Wow 12 tone randomness with midi and interaction. Lil spendy but if the midi works well then i shall give my full blessing. This is a dissonant gem of beauty.

Developer Response ,

Thanks for the feedback. Do not hesitate to mail me, If you have any questions with XII.

arpegiator99 ,

App crashes on launch! iOS 7? Seriously?

I would expect more for a $20 application.

App Privacy

The developer, LIU HAO, 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

    With Family Sharing set up, up to six family members can use this app.

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