no idea about FGD. But I found 'transcription buddy' really really useful. Its free to download from www.download.com and has a free 30 day trial - when the trial is up, then uninstall and reinstall and it lets you use it again. I've used it for 4 years for free now!
It has automatic pauses so rather than pressing pause, play, rewind all the time you can set a speed for the interview, then it will loop depending on what times you give it e.g. for a fast speaker you could have
play: 9 seconds
pause: 3 seconds:
rewind: 2 seconds
play: 9 seconds
..
and so on, so it continually loops whilst slowly moving through the recording. and you can change the speed of the speakers voice etc. - although obviously only good for digital recordings.