Here is a little tool that looks up strings from the speech.info and a mi1.txt (scummtr.exe -w -g monkeycdalt -of mi1.txt -H) in the same dir and outputs a "match.bat" with "ren sample.mp3 linennumber_sample.mp3". It splits up multiple lines (\0xff\0x03).
It's a *very* dirty hack but should do the job.
http://helicoid.de/scumm/mkspeech.zip
This can be used as a starting point for generating a monster.sou - even with multiple lines like LogicDeLuxe proposes.