Thanks for your attention to this Mattias, greatly appreciated.
I've done some further investigation
Cambridge Audio DAC shows as 'CA USB Audio' in Windows and in Tidal.
In Foobar it is CA USB Audio ASIO driver.
You are right, the Cambridge is not using ASIO with Tidal, but it is avoiding the windows audio volume controls and switching sample rates as required. (This is presumably the Wasapi you mention)
The RME works fine with Foobar, switching sample rates as determined by what foobar is playing.
However with Tidal the RME (Analogue 1+2) appears to be resampling everything to whatever rate is set in the little fire box window.
Tidal plays at 44.1. RME says 48. Tidal plays at 88.2 RME says 48. (or 88.2 if I change it manually.)
With the RME driver uninstalled the outgoing sample rate appears to be fixed by whatever is set in windows. (and without the driver there's no ASIO for Foobar)
Is this all as it should be?? Is that how it's supposed to work?
Because if it is I have spent a lot of money on the wrong box.
As a domestic listener I want to listen to various different things at different sampling rates without having to worry about switching anything.
In a studio it's fine - you set your sampling rate for the project and forget about it. But at home I might want to listen to a CD, a 48 wav , a 44.1 stream. an 88.2 stream and then a 44.1 wav, all one after the other, with minimum fuss.
My point being that if the ADI 2 is aimed at the high end hi fi user then it's not really doing the job is it?
It should be effortlessly extracting the highest quality possible from whatever it is presented with.
Unless I am missing some fundamental point it appears that my £150 Cambridge DAC can deal with whatever it is presented with far more elegantly that the £850 RME. Can this be right? Or is it that the ADI 2 is really a studio device which has not yet been fully adapted for domestic use?
I was attracted by the high quality D/A and the DSP possibilities but now I'm puzzled and disappointed.
Your further thoughts would be much appreciated
James.