I'm looking for notation software with good playback. It doesn't matter to me if it's default or if the program has to be modified.
IE: Musescore is a notation software, but has horrible playback. Even with different soundfonts, they tend to make a few things sound nice while still leaving others garbage.
I am aware of EWQLSO (East west quantum leap symphonic orchestra), and how it can be synced with sibelius. However, both of them are prohibitively expensive (1k for sibelius, 300 for gold editon of EWQLSO). I have pirated EWQLSO to see if it would work with anything, only to realize it comes in .nks files which I have no clue how to work with. Apparently it's related to 'native instruments' and konpakt, which I have no clue how to work into sibelius.
I am not looking for a digital audio workstation. I am looking for notation software with good playback.