LOOP

electronic units for modifying the sound produced by musical instruments, namely audio and video recorders and amplifiers; video monitors for displaying music produced by a student for use as a teaching aid and as an aid in music therapy

electronic units for modifying the sound produced by musical instruments, namely electronic delays, reverberators and filters; sound repeaters for repeating sounds produced by musical instruments for use by an improvising musician in developing polyphonic repetitive musical themes in real time; music synthesizers