released in 2009:
EKG, Electricals (another timbre)
Heard Laboratories, performed, on Chicago Sound Map Performs Compositions by Olivia Block and Ernst Karel (Kuro Neko)
to be released January 2010:
Ernst Karel, Heard Laboratories (and/OAR)
Ernst Karel and Annette Krebs, Falter 1-5 (Cathnor)