Now I'm a total beginner at using this so bear with me.

I've been trying to get the strings to play both arco and pizzicato in the same staff and I wish to know if this is at all possible, if not how may I achieve the same effect, or should I just resign myself to never being able to do the two techniques together.

I've already tried merely typing in the performance directions above the staves, which works fine when I use the original sounds but it doesn't work when I use the GPO instruments even though I've loaded the pizzicato sounds into the player.