Hi Mojka,
If Cakewalk has a function where you can reverse the track then there's no problem. I'm a Cool Edit Pro man myself - most other wav editors have this function also.
When you record the original track just be sure to leave enough time at the beginning for the preverb. If you forgot, or after adding the reverb you find you haven't left enough time, then insert a few seconds of silence at the beginninmg of the track.
Mark the track, and reverse it and then apply the reverb. How much reverb depends on the material you are using - use a small amount (Concert hall or something similar) and then judge it from there. Reverse the track again and there's your preverb.
As an example, I've done two small examples. Please don't laugh at the quality, as I did the whole thing in less than 15 minutes - no noise reduction, EQing etc.
I wrote the track "CureReverse" in MIDI (using a programme called Encore) and recorded it directly in Cool Edit Pro. Applied the steps outlined above and came up with the second track "CurePreverb". I borrowed the material from the Cure -Lullaby, I hope Robert Smith won't mind.
As I said, I did this in 15 minutes, but if I was seriously going to use this, then, on hearing it for the third time, I probably would only preverb the first note and reverb the second note as this gives a nice "swell" intro. As with all effects, overdoing it spoils the whole effect - I find more is less.
Regards,
John