found: His Convertiertes Phantasiestück, 1988:t.p. (Caspar Johannes Walter)
found: Klangraum, c1991(Walter, Caspar Johannes; b. 5-25-1964, Frankfurt)
found: Walter, C.J. Musik für Flöte solo (1983), 1983?:t.p. (J. Walter) caption (Johannes Walter)
found: Caspar Johannes Walter WWW site, August 14, 2020(Caspar Johannes Walter; born in Frankfurt/Main in 1964; composer; cellist in the Thürmchen Ensemble, which he also co-founded in 1991; since 2013, professor for composition at the Musikakademie Basel/Switzerland) - https://www.casparjohanneswalter.de/