The plug-in helps you in other applications but not necessarily with RiffWorks. It allows you to use GearBox in a format called "VST" which acts like a plug-in to whatever track you are recording to. This way, you can record guitar using one setting, amp or effect and re-open your file later and change anything in GearBox AFTER it's recorded. Pretty cool huh? Most applications have this feature but RiffWorks currently does not support it. If you use other recording software like Cubase, Sonar or my favorite, Reaper (
http://www.reaper.fm/) you can utilize this functionality.
As for the added "vocal settings" or pre-amp emulations, if you do vocals they are worth the price alone! They help add warmth and "tone" to your vocal tracks. They are also great for bass and even guitar.
Depends on how you want to use this stuff if it should be worth it to you or not. Someone else here might explain it better if this doesn't make sense?
Check this out.... They take a recording of "American Woman" and add GearBox plug-ins to each track (vocals, drums, bass, and guitar). You can use the "Bypass" button on the right to hear the tracks dry, before the GearBox plug-in is added. This let's you hear how the plug-ins can be used AFTER a recording is made to change it anyway you want...
http://www.line6.com/gearbox_plugin/tour.htmlRich