If you don’t have an external sound card, you will probably not have an ASIO driver.

If you own an external sound card/audio interface, use its official ASIO driver (they usually provide the best quality).

Jamulus uses ASIO to provide the lowest latency. Have a look at how to set up ASIO4ALL below, if you’re using that. When you’re done, you need to set up your audio hardware. Now you should be able to use Jamulus just like any other application. (If you grabbed a new version of Jamulus and are one of the first people who downloaded it, Jamulus won’t be whitelisted by SmartScreen yet. If you get a warning notice from SmartScreen, click on “More info” and “Run anyway” to install Jamulus.

Install Jamulus: Double click the installer to launch it.

For more information scroll down to the ASIO section. If you don’t have an external sound card, you probably need to install a generic driver like ASIO4ALL. It is recommended to use a sound card/interface with a native ASIO driver. Make sure you read the Getting Started page. Using Jamulus | Getting Started Installation for Windows

Asio4all v2 no sound