@Morphoice
Ah, no but that is a reason to reset everything!
Under many conditions, changing parameter values all at once can produce monstruous audio. Like, if the DSP effect has feedback, if you don't clear all the buffers, the audio from before the switch, could blow up under the new parameters. There are scenarios that can sound really horrible or blow out your speakers. I mean, let's say the new preset has different reverb parameters, you'll get all the reverb knobs yanked while it's still playing, and get all that washy doppler... Of course that's not a horrible situation, but you can imagine that certain DSP would produce really loud nightmares. Which is why it's quite sane for Hise to send reset() on a preset change, to clear out all the buffers and start from silence. It's the safest thing to do.
But I agree that creatively, there are situations where this is not what you want. But you can understand why Hise went with the blanket solution.