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Is the 64bit RPi OS from the latest beta?
The latest beta seems to be: https://downloads.raspberrypi.org/raspios_arm64/images/raspios_arm64-2020-05-28/2020-05-27-raspios-buster-arm64.zip
I installed 64bit RPi OS via BerryBoot. The sound control device is still old one device with multiple output. It is not the same as the new multiple sound devices in 32bit release dated 5/27.
It is a kernel module option - you can edit cmdline.txt to get that.