I cannot figure out how to load a new 3rd party synth or drum plug-in into Logic Pro 7. Can anyone give me some pointers ? I kjnow how to use the included plug-ins but cannot use otheres HELP !

Make sure the plug-ins are AU (audio units) compatible. That's the format that is supported by Apple directly. If they are installed correctly logic should detect them on start-up when it scans for AU plug-ins. There can be issues when using multiple user accounts in OSX, but apart from that it should be straightforward. If you want a list of all the AU plug-ins recognised by logic go to preferences>Start logic AU manager (I don't know about logic express though). You can try rescanning from there if the plug-in did not pass the validation (haven't tried the latter myself).
Cheers
Kwasi

Loading the AU manager in Logic Express is the same as in Pro. Logic Express, Preferences, Start AU Manager.

Mike Berry
Berry@Hawaii.Edu