Eddie the super midi tracks have no sound attached to them they are well midi files. In order to hear then you have to run them through a synth. The error you see is telling you that it can not find the Hi-Q piano sounds from sampletank.

Do you have sampletank installed, and if so, did you install the sample files, and if so do they show up in sampletank. The way this works in Biab is it automatically loads the sample patch for you, but first it has to be installed properly.

Hope that helps, and if i am not understanding you please clarify.

HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB 2025, Realband, Reaper 7, Harrison Mixbus 9 32c , Melodyne 5 editor, Presonus Audiobox 1818VSL, Presonus control app.