Tap START.
Drag the big colored circles (Bass / Sparkle / Noise) out of the gray zone into the colored zones.
Drag tiny squares (▲ ⚡ 👻 🌿) onto a circle to make it change.
HEART = tempo (drag left/right)
DARK = bassy / close
BRIGHT = sharp / shiny
FAR = echo / distant
SLEEP (top gray) = mute