Hi! I’m pretty new to the Tempest too, but from what I’ve experienced, when the slider is set to “osc all freq” in performance mode, it’s not typical for all voices to jump several octaves up just by touching it. It sounds like there might be a specific setting or modulation routing causing that behavior. Since the individual sounds don’t do this, maybe check if there’s a global modulation or performance parameter assigned to that slider? Sometimes those can affect all voices in unexpected ways. Hope this helps!