It was historically common in Asian-market slot machines and various MSX-compatible computers due to its reliability and compliance with the 8910 standard. Core Features and Specifications

Despite the age of this component, several sources still host scanned PDFs of the original datasheet:

Combine the outputs of the tone and noise generators for each of the three channels.

(Envelope Period) : 16-bit value setting the complete duration or cycle speed of the envelope pattern. R13cap R 13

: Three independent programmable sound channels.