Heemann's early favorites included Van Dyke Parks, and offbeat experimentalists like American West Coast radicals The Residents, Tuxedomoon, Chrome, MX-80 Sound and Renaldo and the Loaf.
Though his hometown featured some notable experimental rock groups (like Rufus Zuphall and Necronomicon), Heemann was largely unaware of them and of the larger "Krautrock" movement until introduced to it via British or American friends.
Other titles include Melchior – Aufmarsch der Schlampen, Küttel im Frost and Abwassermusik and give proof of an extraordinary sense of humour and a profound knowledge of German underground as they are full of references to major Krautrock electronicisms.
Heemann's new projects included numerous collaborations with Edward Ka-Spel (from The Legendary Pink Dots) with whom he produced "Kata-Climici-China-Doll" and later worked together in the band "Mimir", composed half-and-half of H.N.A.S.
Mirror, a duo with established English drone musician Andrew Chalk was a very fruitful collaboration with many releases, often initially appearing in limited, hand-made editions before being reissued in more widely available form.
After the split-up of H.N.A.S., Heemann also became active as a solo-artist: The number of TV appearances (such as in Nancy, France), live-performances in locations such as Austin, Texas, Chicago, Toronto, and Tokyo became more frequent.
Solo works include titles such as Invisible Barrier (1992), Aftersolstice (1994), Days of the Eclipse (1996), Magnetic Tape Splicing (1997), "The Rings of Saturn"(2010), the latter being an allusion to the German novel of the same name by W.G.