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Thank you for your advice about the reliability of pipewire.

Having tried your various suggestions about the sample rate problem, I still seemed to be getting some anomalous behaviour. I was running Ubuntu Studio 22.04, and discovered that in that release pipewire is only enabled for some functions. I decided to install Ubuntu Studio 23.04, in which pipewire is the default sound server, and everything now seems to work seamlessly. So perhaps Ubuntu Studio 22.04 is best avoided. The version of pipewire I now have is 0.3.65.

Thanks again for your help.