If you have an echo when playing video using a capture card, you have your pc setup to transfer the audio directly from the input to the output AND have the computer process the audio. To eliminate the echo, you need to double click on the little speaker icon in the lower right corner, click on options / properties, make sure playback is selected and click OK. Make sure that the "input monitor", "microphone" and "line in" Mute check boxes are checked. If they are not checked, the audio directly goes from the input source to the output. When the StrandVision player processes the audio, it runs through the process and it comes to the speakers again - but a little delayed - giving an echo effect. Once those are checked, it should take care of the echo.
If there is no sound when playing our signage, the input source is not selected correctly. Double click on the little speaker icon in the lower right corner, click on options / properties, make sure "Recording" is selected and click OK. Check the "Select" check box by the one that has the audio wired in.
Another option (Only If You Are Not Playing Stored Videos) is to bypass the computer entirely and wire the audio from the DVD / SATELLITE / CABLE BOX directly to the input source for the TV.
Don't forget to take advantage of StrandVision's cable, satellite and local video options.. Here's the link to the instructions: http://www.strandvision.com/?television_playback_instructions