Since the beginning of his professional activities in 1973, Hirasawa has produced a prolific number of recordings, with a constant stream of releases since 1978, under his own name as well as multiple bands and side projects.
Outside of those included on Model House Works, most of these jingles have never been officially released and not precisely identified—by Hirasawa or his fanbase—but among his clients were companies like Denon, Honma Golf [ja], Japan Tobacco, Kirin, Mazda, Mizuno, NTT, Pip Fujimoto [ja] (rearranging another musician's jingle[13]), Rado, Snow Brand Milk Products, Tsukuda [ja], TV Asahi, Unicharm and Volvo.
[4] After he acquired an Amiga, he took on a handful jobs making both music and CGI with Takara, Itoki [ja] and HTB.
[4] Beyond broadcast work, he also contributed to installations like the Optic Fiber Clock (located on the Bellvia mall near Chino Station, plays a unique Hirasawa song centred on bird chirps once an hour 10 times a day; originally featured karakuri puppet birds that moved in sync with the chirps), Tokai Bank automated teller machines, a closing time tune for a Shinjuku cake shop and synthesizer sound effects to make a Korakuen Amusement Park rollercoaster scary.
"Hybrid" releases, containing both solo and P-Model material, are listed elsewhere (see "live albums" and "videos").