Vertical pinch zoom works perfectly, I find it's just the Horizontal zoom that is counter intuitive.
I find it to zoom to the left even when you are at the start of the phrase with no real precise control either way.
It would be great if you could place the first finger to hold position and then the second finger dictates the zoom direction, or if both fingers worked independently when zooming horizontally.
There's an app called 'Twised Wave' which when zooming into audio files (Horizontally) handles the zoom with great precision and as I describe above.
This would further refine this great app and improve the fluidity when using the note editor.
:Great IAA update btw!