Is there a way to filter a search on RM by typing Bass for all bass rigs and guitar for all guitar rigs?
Rig Manager
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Only if the author gas filled in the Instrument Tag as Bass. Not all people do though so you might not get everything but it should get you started.
There is also a folder in the factory content with Bass Rigs which is a great place to start. -
First make sure, that the tag "Instrument" is added to your list in Rig Manager.