Microphone Activation/Deactivation "PING!"

How do I turn down the volume of the "PING!" that sounds when the microphone activates and deactivates? It doesn't appear to have any connection to the regular audio and ringer volume levels and even if they are turned down very low that microphone "PING!" is extremely loud. I'm trying to use the dictation function and I'm in a setting where I need to keep the noise level down for the sake of other people. With the audio volume set low, it will read it back to me quietly, but as soon as I activate the microphone to dictate more it produces that loud "PING!" and then when I'm finished it deactivates with a different, but still loud "PING!"

Is there any way to change that?