This is a limitation imposed by the ASIO specification. Only one ASIO driver may be used at a time. To switch drivers deselect the currently selected input and output drivers then all the options should be available.
Ah. You need to de-select *both* input and output before it releases the previous driver. I was only doing the input side and it didn't work.
Yamaha Steinberg USB greyed out
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Ah. You need to de-select *both* input and output before it releases the previous driver. I was only doing the input side and it didn't work.