I'm using a PAM8302 amplifier with a Raspberry Pi Zero W and it's working great. However, I'd like to start the amp muted and then unmute it from a Python script. Per documentation, PAM8302 goes into shutdown when the shutdown pin is connected to ground and I verified that by connecting it to RPi's ground. I tried connecting the shutdown pin to a GPIO pin that starts low and one that starts high (measured ~0V and 3.3V respectively), and neither mutes the amp. If I hook it up to ground it mutes, but I can't unmute it, since ground pins aren't controllable. Is there a way I can have programmatic control over the mute function? The only way I can think of is using a relay, but I'd rather avoid it if at all possible.