Steps to recreate:
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Instatiate an Instrument track for a multioutput instrument and enable multiple outputs (e.g. Vienna Ensemble Pro)
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Open the Inspector and/or channel strip in Project window and make sure the fader is visible
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On the Instrument tracks - Select any other channel output on the instrument except the first main channel.
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Result: On the Channel Stri or Inspector the wrong fader is displayed - only the initial output channel will display now matter what instrument output channel you choose on the track. So