What's Dragon Speech do? I might be able to suggest a replacement app since I do quite a bit of sound work!
Dragon NaturallySpeaking (Prefered) voice recognition software. now owned by Lerhard & Hauspie is just about the best and longest standing PC voice rec. software. Sadly win only.
Like the now abandonded IBM viaVoice and Phillips FreeSpeach (as in beer) it allows you to dicatate text into the mike that it converts to a character stream inserted into the keyboard buffer. ie it truely replaces typing and is not application dependant. (Not just word recognition like the old soundBlaster Voice tools.)
I had this pretty well set up under win98 at one stage and was able to dictate a page of A4 in one hit , speaking very quickly.
Incredibly it only needed about 10 corrections on the page!
I was gob-smacked. Sadly my windows installation screwed up shortly afterwards and the hours I'd spent configuring and training the software to my voice patterns went with it.
The software remains one of the most impressive things I've seen a PC do. Shame it depends on a flakey OS. Hence my interest in seeing it Linux.
I bought v5.5 Fr and it was about as effective with native French dictation which is even more impressive in view of the number of homophones there are in the french language.
Years back they were giving away earlier versions on magazine covers so some free versions should be findable on web or p2p.
Version 4 was good. version 5 and later excellent. Must be at 8 or 9 now but I think the engine changes little after v5, its more front-end niceties and IE integration gimicks.
If you have a dual boot its worth taking a look. Very effective even with minimal training/setup.
Sorry that was abit long but you did ask

Linux, because I'd rather own a free OS than steal one that's not worth paying for.
Gentoo because I'm a masochist
AthlonXP-M on A7N8X. Portage ~x86