Can I add annotations to a file to remind me of tasks?

I'm editing a sound file. As I work along I sometimes would like to add a "sticky note" or annotation to a location in the recording to remind me of a chore I need to do there. (Such as "re-record!") I'd like to be able to add color-coded notes -- even notes that are big and flashy. But this doesn't seem to be possible. The closest thing I can find is the MARKER function. I'm not sure what markers do but I see that I can use a marker to flag or tag a location in my sound file. Then I can change the name of the marker to something to get my attention or remind me of the chore. But this seems very limited. So I thought there might be some other full-featured tool I can use to add notes to my sound file projects. (I notice the recent question that seems somewhat close to mine, and the answer was to use markers, etc.)