I have an Audio Fx sound board from Adafruit, and it has 10 channels from which I can trigger sounds. I have a momentary switch hooked up and it works great, I can press the switch, trigger the sound. But now I'm looking to do this from software. If I hook up GPIO #23 (for example) with a wire to the device it will just keep playing the sound file. So, I'm guessing that I need the default of the GPIO pin to be 0v, correct? Or do I need to put something in-between the GPIO and the sound board?