You may want to check out Transcriber
(http://www.ldc.upenn.edu/mirror/Transcriber/Index.html). It includes a
submenu for inserting events for various kinds into the transcript (e.g.
pauses, laughs, etc.). There are predifined options but you can edit these
to define your own. You should also be able to find some work either on
Transcriber site or else where on the LDC site at UPenn on transcription
conventions.
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