Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Propellerhead Software is a music software company, based in Stockholm, Sweden, and founded in 1994. They are most notable for the studio emulation Reason. Propellerhead Software was founded in 1994 by Ernst Nathorst-Böös, Marcus Zetterquist and Pelle Jubel, who still hold prominent positions within the company. Their first release was ReCycle, a sample loop editor that could change the tempo of a loop without affecting the pitch. The export medium was Propellerhead''s own REX format. ReCycle was launched in conjunction with Steinberg, who marketed it as a companion to Cubase, as it brought a simple way of gaining control over tempo and timing of audio loops. In 1997, Propellerhead released ReBirth RB-338, a step based, programmable sequencer which emulated classic Roland instruments commonly associated with techno: TB-303 Bass Line Synthesizer and the TR-808 and TR-909 drum machines.