Tiiliitian is an avian alien language where any vowel can form a two-note chord pattern. To speak it, Idrisah the xenotranslator uses a keyboard device that records her voice and plays it with an altered pitch pattern. The Tiiliitian alphabet has 16 distinct tonal forms for each of its five vowels.
(Finally taking the plunge on making this an actual conlang. Grammar is next. Wish me luck…)