In preparation of capturing Siren, the sister of Banshee, Egon Spengler prepared headsets for the Extreme Ghostbusters that would protect them from becoming enthralled with her voice. However, in the battle against Siren and Banshee, they lost the headsets after being screamed at by Banshee.
- On page 15 of Ghostbusters Volume 2 Issue #5, a Vocal Pattern Emulator makes a non-canon cameo on a book shelf.
- ↑ Egon Spengler (1997). Extreme Ghostbusters- Sonic Youth (1997) (DVD ts. 11:17-11:23). Sony Pictures Home Entertainment. Egon says: "I've reconfigured these to inversely emulate Siren's vocal patterns. That should protect you from the hypnotic effects."