In past versions of MainStage, setting a tempo in a patch or set would override any tempo setting that was saved at the concert level. As a result, the patch tempo or set tempo changed the concert tempo, and remained in effect until loading a patch with a different tempo. 

In MainStage 3.0.2, patch tempo settings remain in effect only as long as the patch is loaded. When loading a patch that doesn't contain a tempo setting, MainStage reverts to the concert-level tempo.