Dual mono piCorePlayer/AMP 2

Hello, I'm trying to implement a dual mono setup as outlined in this guide: https://www.hifiberry.com/docs/software/dual-mono-setup/. I'm able to see both of the devices I've created in piCorePlayer, but I can only use one at a time. When I attempt to run a new instance of squeezelite specifying card2, I get this error:

Error: opening audio device: Device or resource busy

Any clues as to why I can use both devices?


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