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R3lay VSC (Virtual Sound Card)

R3lay VSC is another program in the R3lay suite that, like virtual patchbay, can be used to get audio in and out of the frame, if you have the third party AOIP license o your IPA card.

You can get a demo of the R3Lay patchbay product here:

The demo is fully functional and allows 2-way Aes-67 AES67 streams, but after 15 minutes it will start to add white noise into the streams once a minute. This is great for testing, if you want to use it in a real production environment, reach out to Lawo for pricing.


Run the installer for VSC and get a nic NIC (lan port) on your computer onto the AES-67 capable network that your E-IPA’s AOIP nic NIC (LAN port) is on. You’ll want to put this nic your PC’s NIC onto the same unicast subnet as the IPA card, and it is highly recommended that this nic PC NIC associated with you R3LAY VSC gets used for AOIP only (not for internet or any other traffic), so as to avoid network issues.


Click on the Lawo icon at the top right to get into the settings menu. In the ravenna menu, set your NIC settings, Multicast and PTP for your use user case. Clear-Com Default PTP domain is 127, DSCP of 46, and I would set your multicast addresses to be fixed and put it in the same space as streams coming from the frame, being careful to not create IP conflict. Before you do anything, check you have PTP. You should see the Sync button on the home screen turn blue, and see appropriate settings under diagnostics>sync.

Next, give your first output stream a name by clicking on the grey box on the right side, and set it to active by clicking on the active button. Then, we’re going to pull its SDP so we can add it to an eclipse Eclipse AES67 3rd party port. You'll find it under diagnostics>Send. Scroll all the way to the bottom to find the SDP, and copy it to a notepad. This will make sure that line breaks and formatting is preserved.


As mentioned previously, making sure that PTP works is your number 1 priority.

  • Make sure your domain and announce settings are correct and seen by Lawo VSC.

I’ve had no issues using the E-IPA card as VSC’s PTP GM. You can see those settings here in VSC under diagnostics>Sync.

Also in diagnostics, you can see packet counts for send and receive streams. If you see 0s under bytes received, or large packet losses, that would indicate a network problem.


Additionally, any change you make on the settings menu in VSC requires a stop and start of the VSC service, seen at the top here, the blue stop button next to r3lay R3lay VSC. This is also a reasonable troubleshooting step if you are experiencing unusual behavior.