When I change the samplerate of my session, only my first Audio Interface...

When I change the samplerate of my session, only my first Audio Interface changes to the new samplerate.

In the Playback Engine dialog, check if the correct interfaces are selected, and check if empty ports of your mix cards are set to 'No Interface'In some cases this issue can be solved by moving the Multiprocessing folder out of the "Extensions" folder, into the "Extensions (disabled)" folder.

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