Thanks ! Yeah, I'm using Musescore 4.6 (not the latest version, because I prefer the 4.6 version), the soundfonts used are made by MuseHub and they are free on Musescore, that's why I'm using it. I've always preferred writing scores than doing on Ableton or FL Studio... as you said, we really have to think about each measures, each bar... I'm still working a "final final" version of this song so I could use it for a future game !