"Low Ghost" pitches sound when I add articulation

…most often happening in the lower voices, trombone in particular… I can delete the articulation and then the “ghost” sounds go away…

It sounds to me as if you have changed the sound loaded for your trombone sound directly in the HSSE interface, so the key switches etc. in the expression map are now being played as audible sounds instead of triggering changes in the sound. Go to the Endpoint Setup dialog and change the expression map to something like ‘Default’ or ‘CC1 Dynamics’.

Thanks. I’ll give it a try.