Totally Free Sound Effects #27 – Knocking on a Glass Door May 12, 2015 by Soungle Sounds 98.3 The Snake - The Classic Rock StationTue, May 12, 2015 3:30pmURL:Embed:We created this in-house. If you’re able to give credit, “983thesnake.com” is appreciated. Enjoy! If you’re new, Subscribe!