ISMF is the abbreviation of Indeterminate Synthetic Music Feedback. In short, ISMF produces unique music at the same moment one is listening to it. ISMF music is not recorded music, it has never been heard before, and it will never be played again.

The procedure that generates ISMF music is based on measurements on quantum mechanical, unpredictable processes. Hence, ISMF music systems may evoke unique, and sometimes exceptional experiences.

Originally designed as an artistic-scientific device to increase inner imagination in 2007, ISMF applications are found in consciousness research and psychological intervention.