What I was explaining Pamisano...is the effect is only 'on' during that one note. Hence why a momentary trigger is best in my eyes to turn it on/off. That being said its only on for a split second. So with some painstaking time consuming tweaking.....I was able to play with the depth/rate parameters enough so that when I would turn it on and hit that note, it was making 1/2 of its sweep. Only thing of course is that unless you have the effects set to a patch BPM settings and you play to that BPM every time, it will never be fully in sync so you will never get the actual half sweep to sound perfect with the timing of the picking of the note, but as long as that first note is 'effected' and the rest are straight amp sound, then I think it works fine.
does that clear it up?
If not, usually flanger/phasers have a full sweep....starts at 0, goes to 100, then back to 0 (for ease of explanation). The idea is to set the rate/depth so that it hits half of that during the duration the effects are turned on. as I stated unless you play with a click track and program the bpm of the song perfectly, you may get results that sound like they are starting at 25, hitting 100, then ending 75.....next time might be starting at 40, going to 60, ending 50....because the effects are still moving at the set parameters even though they are 'off'.