Good news today!
After many hours spent on it, I'm happy to tell you that the audio playback is now able to handle long notes.
In fact, many users told us about their frustration to have a good quality playback with a lot of different instruments, which was unfortunately not holding notes for more than 3 seconds. We were extremely frustrated too.
Notes are now getting a nearly natural sustain. For instance, for the piano, the lower the pitch is, the longer the notes will be able to last. Strings and wind instruments get the same maximum duration regardless of the pitch, like in real life.
I hope you are enjoying these changes and that you will not feel any frustration anymore!
Ours is gone :D
Have a good day!