Mapper gained some kind of audio note taking system some weeks ago, and I finally had a chance to properly test it by doing some mapping, so I mapped the Kohmo and Pääskyvuori suburbs in Turku, a couple of days ago and it went pretty well after figuring out how to sync the audio note with my track in JOSM.
The only negative with audio notes is my own voice.. can't stand it. (And speaking to yourself in an empty car, feels a bit stupid)