if you changed the notes on the synth that comes in at 0.29 to harmonize with the bassline you'd make a much more interesting track rather than everything playing the same melody. And yeah, quite a lot of the notes are offkey. If it's just the synths than it could either be the semitone offset being wrong, the tune being wrong, the offset being wrong or if you have a chorus plugged in the speed could be way to high