You can add your own audio to your messages by grabbing a microphone or headset and record yourself using Quicktime or Windows' Sound Recorder. Once your messages are recorded, head over to a site like media.io to convert them to WAV files, then click the microphone icon in the bottom right corner of the messages to add them to your workflow.

Once uploaded, you can click the play button in the bottom right corner to listen to each message's voice file.

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