The tweak command

[Peter Gentry]

Doing a bit of study on the tweak command there is some apparent minor 
contradiction.

The manual states categorically that the \tweak command must be preceeded by an 
articulation (often the "use default" articulation -
is used). 

However many examples omit an articulation - is this when a default 
articulation is implied? 

Would it be prudent for a blundering old fogie to always supply an articulation 
even though it may be implied?

regards
Peter Gentry