I record presentations in Keynote and export them as videos as well as presentations. I find that I have a moderate ess in my voice. Is it possible to run some sort of pre-processor plugin with macOS to de-ess and compress my voice between the microphone and the recording in Keynote? Alternatively, I could export the video, extract that audio and copy it into GarageBand and process it there before playing it back into Keynote. I don't need pro-level results, but if I can easily sound better that would be great. Can someone point me in the direction of learning to do this? I've experimented with microphone positioning and a pop-filter and that helps. I'd like to go a step further. I'm using an Audio Technica AT2020 USB mic. Thanks.