FlexASIO - I used to experiment with two instances of Gig Performer and it worked, but it was not stable enough for serious use (prone to crashing, initialization errors, text based config (although 3rd party GUI tool exists)).
VoiceMeeter - in my tests it had latency issues, but I see that people use it e.g., this YouTube video for Zoom sessions, and another example is Rocksmith streaming on Twitch (click here to learn more).
I tried Voicemeeter when I was using a Steinberg UR22 audio interface. I can confirm that it worked correctly and without bugs, but I didn’t pay attention to the impact of latency as it was not a live use. The buffer was set to 44.1/256.
This helped me a lot before I bought a Babyface Pro interface.
It’s designed to be an open source cross platform low latency application to application audio routing program.
Some time ago i was going to toss out the idea of the devs looking at the Jack interface (which I believe is available in Juce) as a mechanism for inter-instance audio routing. But i thought i should do some more playing with it before making such a suggestion, and i never got around to it.
ASIO is not the main goal because it’s a Linux/Mac/windows thing, and ASIO is purely a windows thing. But it does offer ASIO on windows.
The plugin works as you said, bringing in audio of an app from outside GP.
The sound quality seems good. The plugin has no UI, no controls at all, so make sure the volume of the app producing the source audio is at a reasonable level. Minimal CPU usage–less than 1%.
What is this?
The Steinberg built-in ASIO Driver is a universal ASIO driver for Windows that works with a wide range of audio interfaces. Its main purpose is to make it possible to use interfaces that don’t have native ASIO support - usually integrated sound chips on mainboards.
Requirements
The Steinberg built-in ASIO Driver supports Windows 11 and 64-Bit version of Windows 10.
You can also try using it with older 64-Bit version of Windows, but this has not been tested. A 32-Bit version is not available.
The Steinberg built-in ASIO Driver can be used with any ASIO-compatible audio application. However, we can only provide support for the use of the driver with Steinberg software.
It can also be used with any audio application that requires an ASIO driver.