Piotr Cisak (Kepa Yew) comes from Gdansk (4 year old episode in Krakow)
Operates the blog „Prima-Materia”. He led the radio broadcasts from Radiofonia for a year (2011/12).
At this time works with www.polyphonia.pl.
He co-stared artists like: Jan Jelinek, Aidan Baker, Leah Buckareff, Nadja, Mathias Delplanque, Plaid, Martyn, William Basinski, Andy Stott, AnD, Loscil, Talvihorros, Iroha , Dadub, Milton Bradley, Jacaszek, Jarboe, Helen Money.
He also performed at the Festival Audioriver 2012, Ambient Park 2012, VII After Party Tauron Nowa Muzyka, in Germany, Austria and France