@jonas
Sorry for the late reply. I thought I would be notified by email if someone replied.
OK, I understand that the replay gain data is not displayed in Strawberry, but I have another reason to believe that it is not being applied at all : I mainly listen to randomized playlists with a large number of tracks, and the output volume varies significantly from one track to the next. I often have to adjust the volume manually, which I don't need to do in foobar2000, for example. To me, it really sounds like there is no replay gain at all. I also hear no difference when I set it on and off in the settings.