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 How do I prevent audio inputs from mixing? The menu goes away quickly, how can I tweak settings? When should I use Encode Later? Comments 0 comments Article is closed for comments.