And I think they're very good Tympani. Each note has two different samples, left hand hit and right hand hit. They're placed two octaves apart and you're to play them alternately, the way a Tympanist would. You can get very good results.
The GPO Tympani are part of the set up in "Basic Orchestra Percussion." The manual shows where the notes are located, but they're quickly found playing on a keyboard.
Each note has two different samples. The two different sets of samples, left hand and right hand hits, are two octaves apart. Using the index finger, one can play Tympani parts in a way emulating a Tympanist, the fingers being the mallets.
Raymond, I think you know that I work exclusively in Sonar. I start my work by playing my keyboard, and then edit in the Piano Roll View, sometimes using other Sonar tools such as the Velocity filter.
How a notation user utilizes these two corresponding pairs of Tympani notes is something I don't know. It has to be in the area of hiding a track, giving zero velocity values to notes you don't want triggered --I don't know. Beyond me!
Looking at the score example you posted, I would play and/or insert those notes, always alternating between the two different octaves of Tympani notes. It really makes a difference using left and right hand strikes, helping to avoid the "machine gun effect," since repeated notes aren't triggering the same samples over and over.
At the places where fast rolls are indicated in the score, I would do what I've described a few times here at the Garritan Forums, playing the roll live, and then shortening the MIDI clip with Sonar's Length tool, to get an even faster roll.
There's currently discussion and info about Tympani rolls in the Tips and Techniques Forum here:
I remember watching a film of one of the Hoffnung concerts, where the timps were, in fact, giant bowls of milk. They looked for all the world just like skins, until the orchestra arrived at the end of the piece, timpanist took a huge swing at the Dominant, and fell in. Sadly I can't find a clip anywhere.
But I think we need samples...with a variety of full-fat, pasturised, goat, yak, etc