I just was gifted the smoke vault 24". I intend to smoke sausage as well as everything else and I've read it needs a needle valve to get the desired low temps. I contacted camp chef and they said it's not designed to go that low but putting the tray on top of the burner may lower the temp??? . I know I've read on here from multiple searches that either a needle valve or regulator of some sort will make it work. I want it to be able to go from 100 deg to 400 deg. Can someone please just "point blank" tell me: 1. Exactly what I need to buy to get these temps. 2. Sand or water in the tray? 3. Do I need the amazin smoker tray thing for low temp smoke and if so do I have to use pellets?