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)