Hello Claudio,
QMidi 2.5.11 (was 2.5.10+last minute fix) is critical for MacOS Sierra users. If you're not concerned
with either Sierra or WinLive WAV lyrics/chord tags (introduced with this update), it's OK to keep 2.5.9 (for a while :-))
Mixage Software
www.mixagesoftware.com
support@mixagesoftware.com