Yep, i've got Sytrus. Thanks for the tip!
Actually, I've already tried lots of things. I think the problem isn't really the sound ; the lead part i'm working on is pretty dull by itself, i'll try harmonizing a bit and changing the articulation.
Anyway, here's what i mostly use for lead sounds :
- saw oscillators
- 12 an 24dB lowpass filters (nice for modulation)
- a bit of distortion or overdrive (sounds better when applied only to mid and low frenquencies)
- flangers (fantastic to make the sound thinner, or wider, and add some expression)
- FM synthesis (yep, you were right, Nase), it helps making rich sounds without using distortion, which is useful when you want to play some chords (other than power chords).
- low cut filters
- oversampling, often necessary in the high range
-...
this is it, for now. Maybe i'll post some more stuff if i find anything interesting.