The Ear Tone Toolbox is a free collection of instruments that evoke naturally generated tones in the ear. Called difference tones or auditory distortion products, the “ear tones” occur at separate frequencies from the provoking acoustic tones, sound as if they emerge from within the head, and are not physically present in the acoustic space.

FOAFX is a command line tool for applying spatially positioned audio effects to first order ambisonic sound files. It is written with Elementary, a JavaScript framework for writing audio applications, and uses its offline-renderer package. As its input, foafx expects a B-format, 4-channel first order ambisonic encoded file with ACN channel ordering. It supports file normalization either in SN3D or N3D formats.

FOAFX_GUI is a Max patch for configuring and running the FOAFX command line tool.