Audio notes for waypoints

It would be nice to have the option to add audio waypoints when recording a track. It's easier to quickly say something than to type it when trying to get lots of mapping done.
Use case:
1. I turn on GPS tracing
2. I wait until the catch/fix GPS signal
3. I go by car/bicycle or on foot
4. at the interesting place I press button on the phone and say "Smith Street on right, number 31 on left"
5. I repeat point four many times
6. after returning home, I copy the GPX file and audio files from SD card
7. I open the GPX file in JOSM and I see the trail with markers.
8. Click on the marker, I listen to it and I edit the map :)

The spec for how to do this so it can be read in by JOSM is here:
http://josm.openstreetmap.de/wiki/Help/AudioMapping/SeparateClips