Tweaked "Trillspanner"

[Helge Kruse]

Hello,

I am transcribing some drum notes. I found two kinds of spanners that 
look similar to a trill spanner that have been tweeked a bit. Both have 
the wavy line but don't include the \trill in front of the line.

The first spanner starts at the note and stops at the end of the measure.
The secon spanner starts at the note and stops at the next note.

Probably there isn't such a big difference. I assume I can a result as 
in the attach graphic when the "first" spanner is terminated at the 
first not of the next measure.


But how can I get the tweaked spanner? Any idea how to remive the "tr" 
in front of it?

Regards
Helge