Patches for Rob Papen’s Go2 Synthesizer Rack Extension Exciting & modern new sounds…. The Symbiosis Refill boasts extremely high quality patches designed to express the psychotic strength of the Go2 RE Synthesizer. This sound bank has a healthy and unheard palette of unique new sounds ranging from spooky mono synths, other worldly wood winds, gated synths, bells, crazy 808 basses, to brilliant synthesized organs . This refill has 101 patches. The Symbiosis Refill will definitely elevate the creativity in any producer or artist!