I do a radio show, when I pre-record i get a very low end hiss, almost sounds like gain is too high, but its not. If Im live to the station its fine. It only happens when I record. Is there a way to set audition NOT to record that low end sound?

I use an Allen & Heath broadcast board. When I record to my computer for later broadcast there is a low end hiss/hum barely noticeable when im speaking BUT very prominent when there is a quiet moment.

Sounds like gain may be tooo high, BUT its not.  When I do a LIVE broadcast using same equipment all is fine!

Thoughts