I just got a 2016 MDX Base AWD and was really annoyed with the tailgate beep being so loud. There is also no option to turn the volume down. Since it was so annoying to me i found the buzzer and covered part of it so it wouldn't be so loud...so far I'm very happy with the volume...Here's what I did just in case someone else is interested. This will also affect the volume of the keyless access beep. I know it can have some drawbacks but it works for me.