I'm having a very peculiar problem with audio on Windows 10.

I'm trying to copy the output of FL Studio 20 to the input of VB-audio's Virtual Audio Cable - the problem is that I need minimal latency, as I'm playing a guitar and hearing it immediately after it's been run through plugins.

My audio interface (Focusrite Solo 3rd gen) allows for minimal latency and I can hear the output of FL Studio as quickly as I play notes; however, I can't get Virtual Audio Cable to act as an output in FL Studio without using the Asio4ALL driver.

The Asio4ALL driver not only has latency of about 500ms (extremely offputting when playing music) but I can't hear anything except FL Studio when using it.

Is there software similar to VAC that allows me to directly copy audio output **of one program** and use it as an input or some method that allows VAC/VB-Cable to do this?

Note: Stereo Mix seems to have no response, likely because it isn't linked to my audio interface - if that's the solution, how would I do that?