PhonoPaper vs skippodisk

PhonoPaper is a camera app for playing pictures with encoded sound (PhonoPaper-codes). With this app, you can also create your own codes: 10 seconds of sound can be recorded from a microphone and converted into an image. [ Key features ] * PhonoPaper does not require access to the network for decoding; * 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; * code can be played in real-time with hand-controlled speed and direction; * code can be drawn by hand to get some unusual sounds. [ Examples of usage ] * voice messages (or pieces of music) on t-shirts, billboards, posters, postcards, goods; * audio labels for phonorecords; * audio examples in books; * secret messages; * art-experiments. [ How to use ] Launch the app, point the camera at the code (tap on the screen to focus if necessary) and smoothly scan the picture from left to right. The code should be parallel to the frame - try to keep the camera level. The black code markers (top and bottom) should fall entirely into the frame. If the application recognizes code markers, you will hear a sound. If you are unable to play the code smoothly, press the record button on the right side of the screen, this will enable automatic scanning.

skippodisk is a free AUv3 plugin and standalone app. It features algorithm that imitates compact disc reading errors and adds feedback for some comb filtering. controls: * main control is a 2-dimensional slider that changes delay time / buffer size using value on X axis and feedback (positive and negative, -0.997 to 0.997) on Y axis. This control adds some creative comb-like effect. * algorithm settings: 
[ auto ] enables automatic cd skipping. 
[ dropout ] enables adding silence. Use both [auto] and [dropout] with zero feedback value (in the centre of touch control) to achieve the effect of a CD audio glitch * [ bypass ] control and volume control. This slider is in low value state by default.