Video subframe is 1/80 of a frame and audio is down to the sample
The problem I'm finding is that if one is trimming audio you can't have it lock to 1/80 even with snapping on . . . unless I'm overlooking something. If you trim audio in between 1/80 frame interval there's no easy way to get it to snap back to one of those 1/80th frame units.
The ease of subframe editing is nice though. If you're in a situation where your sound recording device and camera recording are some distance apart you can move the audio to compensate for the inevitable time difference between the two.
All the news now and in your digital future