Intelligibility of sung texts depends on speed of articulation and degree of homogeneity of timbre. Pitch variation not exceeding major third preserves these characteristics. By using pre-recorded loops of raw material, a fifth apart, total vocal range can be covered. Within these limits text, rhythm, timbre and intelligibility are preserved and by varying playback velocity, any desired melodic contours realized.
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.