[FCP-L] Remove Attributes - possibly dumb Q

OK, I've read the FM and trawled the interthingy etc. How can I remove
attributes from a master clip in the viewer (in this case audio
keyframes)? I can do it for a clip in the Timeline, but not a clip in
the Viewer or Browser. This clip was modified before adding to a
sequence. FCP7. TIA

+++
With best wishes,

Roger Shufflebottom

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