right hand ↔ pitch · open it for vibrato
left hand ↕ volume · open it for a brighter filter
either hand 👌 pinch (other fingers up) to drag the keyboard
the video never leaves this computer
raise both hands in front of the camera
mouse: move = right hand (pitch) · hold = open hand (vibrato) · wheel = left hand height (volume) · shift+wheel = left openness (filter)