If participants are hearing what sounds like two audio streams playing at the same time, this is because audio from your workstation's speakers (e.g. from Avid/Premiere/other media player) is bleeding back into the live Evercast room via the microphone you are using to communicate inside the live room. There are three primary ways to solve this issue:
1. Use a push-to-talk microphone
This will ensure that participants only hear you when you are speaking.
2. Wear headphones
If you wear headphones during a live session, you should not experience any feedback issues.
3. Manually mute
If you are streaming content and not talking, manually mute yourself using the 'Disable Microphone button' on the toolbar inside the Evercast video conferencing room. You can then enable the microphone manually if you need to talk.
If participants are hearing feedback while communicating, it may be that the sound from someone's speakers is routing back into the live Evercast room through their microphone. You can find out who the offending participant is by having everyone disable their microphones (mute) individually until the issue stops. Whoever is causing feedback should either use headphones or mute when they aren't talking.
Feedback inside the room can also be caused by two people inside the Evercast room who are in the same location and too close to each other. Either ask the participants to separate farther from each other, or have one of the participants disable their mic and audio (from the toolbar at the bottom of the Evercast video conferencing room, click 'Disable Microphone' and 'Disable Audio Output'). That way, you will hear both participants' audio through one feed.