In February Voxeet transitioned the desktop clients for their free voice conference service to a WebRTC-based core. Accessible from Android and iOS mobile clients, with both Windows and a newly released Mac client, it offers both high-quality audio and a novel ability to place participants at various locations in a stereo soundscape.
I maintain that what they deliver is not the “3D audio” that they claim, but that’s really a matter of linguistics. It’s free and very good quality, so what’s not to like?
The availability of mobile and desktop clients provides a low-cost/complexity way to achieve high quality audio from remote participants.
You’ll need to make a local recording, but a stereo recording made locally will retain the stereo image, which could dramatically improve the podcast delivered to your audience.