Using the GoPro Audio Adapter with the HERO 8 camera - ULANZI G8-7 Door - YouTube
Amazon.com: Airplane Cockpit Intercom ATC Radio Recording Cable with Power Cable Adapter Audio Cable for GoPro HERO3 / HERO3+ / HERO4 NOT for Hero 5 and UP : Electronics
Music Input and Audio Record Connect Cable for Intercom AUX Port – Rugged Radios