Electric guitar recording with Guitar Rig 4?

Whenever I record electric guitar (in Audacity, using the Guitar Rig Mobile Interface, then use Guitar Rig 4 as a plug-in effect), I get an airy sound right after I stop playing anything, its not constant, just immediately after I stop playing. And this is really annoying and I don't know how to stop that sound from accuring, especialy because the music I record (metal, deathcore, post ) has alot of breakdowns, and everytime I finish a guitar chug, I get that airy sound. Does anyone know how to fix this, or what might be causing it? Maybe something in the settings of Guitar Rig? If so, what?