Time-frequency box layer
Dan Stowell asks, "is there any way in SV to annotate regions that are bounded in time and frequency?"
There isn't, but there is a way to sketch them temporarily (using the measurement tool). Apparently people working on environmental audio routinely annotate audio using time/frequency extents, something which is less common with music presumably because music audio is usually highly harmonic. So for these users it would be jolly nice to be able to draw out rectangles and then blat them into a layer for future use.