How do I record my Mac's audio with Iris? dominic October 27, 2017 06:00 Updated Follow In order to record your Mac's audio Iris requires that you install Sound Siphon. It is a free download. You do not need to purchase Sound Siphon for use with Iris. DOWNLOAD SOUND SIPHON Related articles Why can’t I select an audio input? How do I prevent audio inputs from mixing? Sound Siphon 2.1.1 Release Notes and Download When should I use Encode Later? How do I remove the Iris watermarks from recordings? Comments 0 comments Article is closed for comments.