Has anyone used one of these? Wondering about use as a substitute for wireless lavalier on a bridegroom - might slip into the top pocket nicely but I'm not sure how good sync would be to a camcorder. http://www.yamaha-europe.com/yamaha_europe/uk/20_proaudio/20_multitrack_recorders/10_no_category/20_professional_audio_workstation/10_no_series/50_POCKETRAK_2G/index.html