Playback is messed up badly

First of all, the playback plays randomly pizzicato notes on string ensambles ( Violins 1, 2, Violas, etc.), and when you input notes it always plays back as a pizzicato note, even tough it is an arco note. The second issue is that playback doesn't follow the nuances that are written, sometimes a part is quieter, sometimes louder. Also, if you want a string part to 100% be played arco, you need to add tremolo to the notes.