PSR is an experimental ambient improv duo that began in late 2003 as a side project of At Knifepoint (now Pulsar47), a post-rock band hailing from Champaign/Urbana, IL. It all started when Dave and Aaron began getting together for frequent jam sessions, often times during post-show At Knifepoint parties. They began to develop their unique sound, built on a completely improvisational foundation. Field testing of the early PSR recordings was done by playing them in public at subliminal levels on Dave's cassette player. They often relaxed in a bar while subtly injecting their music into the background noise of their surroundings. PSR's full-length albums are each recorded in a single take; straight-through improvisations. In this way, they cut out the forethought, and attempt to stumble upon the sonic heart of humanity.