SonicSynthesis

If you have the mix knob set to Preamp, you're always going to hear channel one coming from the left and channel two coming from the right. I don't think there's any way around that. As far as mixing goes, you might want to talk to someone who's more versed in FL Studio. I don't really use it very often. Other than that, mixing is always a lot of trial and error. Just keep at it and maybe post some of stuff for others to listen and give you ideas.