An audio ear-training course for recording engineers, producers and musicians. Moulton started doing such training as an educational exercise for students back in 1969, and has since used it everywhere. In 1992, KIQ Productions asked Moulton to make it commercially available, and the rest is history.

Vol. 1: Frequencies

Trains you to recognize boosts and cuts in all ten octaves of the frequency spectrum. Progressive drills build from simple boosts in music to more demanding single octave cuts in pink noise.

Vol. 2: Effects & Processing

31 possible signal processing changes, grouped into simple families: amplitude change, gross and subtle distortion, slow and fast release compression, equalization changes, stereophony anomalies and time-delay / reverberation settings.

Vol. 3: Delays and Decays

Delay settings from tenths of a millisecond to whole seconds; panning / slap / spaciousness effects — in mono and stereo, on sustained and transient sounds. Reverb parameters — predelays, decay times, etc. Invaluable when creating programs.

Vol. 4: Master frequencies

Advanced EQ. Identify cuts and boosts to within a third of an octave; and two octave bands simultaneously boosted and/or cut.