iTunes: PhonoPaper - Alexander Zolotov
You might remember the video posted here for the Android version (also available).

• format of graphical representation of the sound (music, human voice, etc.); in other words, it is the 2D audio barcode (by analogy with the QR-code);
• real-time PhonoPaper-code reader (using the camera);
• PhonoPaper-code generator (sound to image converter).

• PhonoPaper-code is analogue, so it is not so sensitive to different types of the image distortion (bad camera, dark picture, wrinkled paper, etc.); at least you will hear the "silhouette" of the original sound;
• PhonoPaper does not require access to the network; its code is self-contained;
• PhonoPaper-code can be played in real-time with hand-controlled speed and direction;
• PhonoPaper-code can be drawn by hand (paper version of the Virtual ANS synth);
• PhonoPaper is free!
Examples of usage:
• voice messages (or pieces of music) on the billboards, posters, postcards, goods;
• audio labels for phonorecords;
• audio examples in some textbooks;
• art-experiments;
• learning the basics of the spectral music.

Default PhonoPaper-code length is 10 seconds. But you can make it shorted or longer - playing speed can be changed manually.
Official website with examples and FAQ: http://warmplace.ru/soft/phonopaper
Please try my other apps:
• PixiVisor;
• SunVox;
• PixiTracker;
• Virtual ANS."
All great apps.
Lol, 7 minutes after starting this app on my iPod 4th gen I got back control over my device. Phonopaper started with a 1 minute black screen just to come up with a framerate of 1 frame per ~20 sec... I almost had to reset my device because first the home button didn't work anymore, then the screen froze completely for 3 minutes and I couldn't close the app. After that, the framerate jumped up to an extraordinary 1 frame per 5 sec, then luckily the home button worked again...
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