GHInCH said: I can copy that. I open BIAB with administrator rights. Opening a song with a Midi SuperTrack, change SampleTank 2.x to SampleTank 3, save as a new song. Open the new song and there is SampleTank 2.x in the Plugins again.

But: If I open a song without a preset in the midi part of a style, then the changed Plugin remains as what I have saved.
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That sounds normal, depending on the style. Some styles save the name of the MIDI SuperTracks, and also save the custom synth to use (SampleTank 2.x). This is either saved with the song (which you can override), or the style itself (which you cannot override). If you wanted to override the style, you would enter the StyleMaker and remove the reference to the plugin.

So you're likely using a Style that using a MIDI SuperTracks and also is hard coded to use SampleTank 2.x for that track.

Have Fun!
Peter Gannon
PG Music Inc.