We have the Directwave Plugin. A complete synth, full of features like pitch, fine tune and LFO, however these features are not in the SF player and this can be a bit of a hindrance. Examples: if I want a guitar SF2 to have a vibrato, I can't because I don't have the LFO frequency function within the synth. Or if I wanted to fine-tune an instrument, I simply can't.
One bug that really stressed me out is a very serious crash that's happening in my FLM. I can't access FLM because it gets stuck on a gray screen, then closes and uses all the CPU, making my phone overheat. And this happens every day, I'm trying to fix it but I can't.
Overall, SF Player has significantly improved music production compared to previous updates, but there's still room for improvement (some bugs are also causing problems, such as some SF2 files/patches not having sound). I hope this helped!