Well Greg, there are two basic options adapt. Meaning, Just like us you will get used to it, we thought it would be a bigger problem, like night time use etc. but it really hasn't and the external noise just doesn't raise any attention beyond our own minds. Remember REV builds thousands of these! My camping buddy liked our Bounder so well they bought a Southwind like you! now we echo off each other and laugh about it! Option 2, I have heard is to open the cavity above our propane tank and line the walls around your vacu-flush with self adhesive insulation, which provides some help I have heard!
The biggest golden rule with these is to teach everyone how to use it, and what can go down and what can't! always use more water not less, forget about what they say that vacu-flush saves water.
Happy Camping!
Dan & Bonnie Quasnick
Jacksonville, FL
