The Pacific Northwest's three-day, electronic audio/visual massive, Seattle-hosted Decibel Festival just announced the showcases ticket holders can look forward to at the end of this September. Among the specific gatherings are Ghostly International's 10-year anniversary party with label artists Lusine and Tycho, plus friend Clark Warner, to name a few. XLR8R TV host Christopher Willits, Frank Bretschneider, and William Fowler Collins perform A/V works at Optical 1: Immersion on Friday. Daedelus and Nosaj Thing will be heading up the Terrorbird party Saturday night, and Gaslamp Killer can be found over-hyping his crowd in Volunteer Park Sunday night. Check out the full list of Decibel showcases here.