-- card: 37900 from stack: in
-- bmap block id: 38406
-- flags: 0000
-- background id: 3551
-- name: 


-- part contents for background part 3
----- text -----
square wave

-- part contents for background part 4
----- text -----
rectangular waveform with a spectrum containg only odd harmonics; square waves have a hollow sounding timbre.

-- part contents for background part 16
----- text -----
177