You can have them change inputs before the recording starts on a Riverside Teams plan. You can even change the audio input and output for each guest, and they don't have to worry about adjusting any settings. As always, we encourage everyone in the recording to use a pair of wired headphones to cut down on Echo and audio bleed across tracks.
If you have a panelist that is away from computer or traveling, have them download the Riverside app ahead of time on their iPhone, iPad, or Android phone, and they can participate using the app as well. When it comes to a panel discussion, crosstalk can be a challenge expecting everyone to manage their mute button when not speaking, may not be reasonable, but Riverside has a special feature called Producer Mode that can make a big difference. Invite someone to be a producer during the panel discussion.