I tried it, it didn't really work out.
By using External - Lame I got this error:
Can't execute external encoder:
lame --alt-preset standard --tt "Music" --ta "" --tl "" --tn "" --tg "" --tc "" - "C:/Documents and Set....../Music.mp3
I tried transforming the file to a wav file using wav writer, and that, surprisingly, did work! So now I can play it in winamp, thanks.
Yet if you can tell me how to transform it to mp3 too, or what I've done wrong, I'd be even more grateful, but I'm happy already, so if it's too much trouble, leave it be.