I'm using active presenter, and I'm trying to mute the audio on an mp4 file I imported, while keeping the mp3 file on another layer playing. But it's seeming that whenever I click properties on the item and go to mute the sound of the video file, it mutes every library file. Including the Mp3 I imported on another layer. And if I turn it back on in the MP3's properties, despite it listing the correct name of the item, it turns it back on for the MP4 file. How can I mute one file while another keeps playing? There's no separate layers for audio/video when I imported the Mp4, otherwise I'd have just deleted it that way. Thanks.