Audio looping & manipulation in RAM

Sebastian built an experimental record/looper circuit, resulting in some interesting sample contortionism –

This circuit currently has a few ways to manipulate audio. These are:

A record button allows the user to sample incoming audio to a RAM buffer

A potentiometer sets the input level

A potentiometer sets the sample rate / pitch for playback. The changing of sample rate can be recorded if desired, by physically changing the position of the pot during recording.

The address lines A0 – A18 can be manipulated ie. moved around, removed, replaced, giving a wide range of effects such as stuttering, repeating and basic granulation.

Although this does not sound like heaps of manipulation, keep in mind that this circuit can absolutely mangle a sound beyond recognition. The ADC is running at its maximum speed, and as such the sample rate can be varied greatly for example.

Read on for further explanation of this RAM Music.