Link: Gig Performer | How to use a single-client ASIO driver with multiple applications on Windows
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Honorable mentions:
- 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 (example, this YouTube video).