I normally connect a Piezo via a 100nF Capacitor (same sort I use for decoupling on my PCB's) because I once met a brand of Piezo's that randomly 'hung' when connected directly. See schematic. The Higher drive level option requires having one pin go High and the other Low alternatively. You can achieve this by manipulating the pins directly (you won't drive this conventionally 'as is' by using the PWM or HPWM commands).
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