It seems that when I use high velocity, my instruments sound crisp and trebley but are very loud, almost distorted, and hurts my ears. When I use low velocity, the instrument is clean and sounds fine, but loses its crispness and sounds like its being low pass filtered. Also, certain vsts (such as Discovery) do not respond at all to velocity, whether I use my midi controller or the piano roll. I'd like some fixes to these both because it is holding back my music production. Also if someone could explain what Sustain is (in relation to velocity), that'd be great. Thank you so much
PS: I have a pair of yamaha hs50 monitors, a sub, and a treated room. The problem is related to FL studio, and not my setup. Other songs sound fine.