What you might want to think about is an ensemble, even if the flute is traditionally a solo instrument. When working with samples of orchestral instruments you have to do a lot of get the solo instruments sounding decent, since they're no way to sample them extensively enough to cover dynamic fast playing. If the sample set you're using has multi sampled articulations, what you want to do is load a keyswitch patch (which lets you switch between those articulations via unused notes on the keyboard) or load all the articulations separately and then work with multiple MIDI tracks. If you don't care about realism (which I prefer, actually) then you can layer other flutes over it and create an interesting ensemble. It'll sound fake, but nobody will care (unless you're going for realism, which is a very uphill losing battle).