The sound effects appeared up to and including release 15 - the bells were to remind you of a change of corry and the sound effects were added to make you feel the kick or punch.
Early releases kept the sound effects to the odd kick - whereas by release 15 they were on almost every strike and were becoming quite intrusive. As has already been said the copyright rules changed and stopped this from release 16 onwards.
In South America they take the sound effect free songs and edit some of their own back in - these are very intrusive IMHO and don't really work.
If you have copies of the South American versions then presumeably you got these from dubious sources and you could equally dubiously find the versions without effects - but I wouldn't be posting how you managed to find such things on a Les Mills forum!!
Please read my blog at:
www.grandnat.co.uk