I've decided to start doing two types of tips in the forums -- the normal tech tips, plus little hints of advice which I will call "Quick Tips." Sometimes you just need a simple reminder, not a complete article...
So, to browse sounds by a particular plugin, you have 3 options:
1) Right-click / ctl-click on one of the column headers in the Attributes section, and expose the "Path" column. This allows you to browse the factory content of a given instrument (i.e. the factory sounds that shipped with that intrument).
2) Right-click / ctl-click on one of the column headers in the Attributes section, and expose the "Plugin" column. This will allow you to browse all the sounds that use that particular instrument or effect in any way, whether exclusivley or as part of a multisound.
3) Type the name of the instrument in the search field