In the following paragraph:
Two or more \keepWithTag filters applied to a single music expression
will cause all tagged sections to be removed, as the first filter will
remove all tagged sections except the one named, and the second filter
will remove even that tagged section. Usually you would rather want to
use a single \keepWithTag command with a list of multiple tags: this
will only remove tagged sections not given in any of the tags.
do you think that the last sentence is clear?
I'd rather write:
this will only remove tagged sections not specified in the list