Soundscriber aids linguists in transcribing audio files. As explained by its creator, Eric Breck, it “includes features specifically for transcription. These include keystrokes to control the program while working in another window (e.g. word processor, SGML editor, etc.), variable speed playback, and a feature called “walking.” Walking plays a small stretch of the file several times, then advances to a new piece, overlapping slightly with the previous one. With this feature, it is possible to transcribe continuously without having to manually pause or rewind the recording.”
It’s available here, at Eric Brecks’s University of Michigan home page. Screenshot below.