Roon 1.6 ... with Qobuz

[Hifi_swlon]

...I find Focus search difficult to use (for example, I cannot say 'everything NOT classical' or 'NOT in Qobuz" i.e. local).

I won’t get into the UI - especial 1.6 which I think has got messier and more incoherrent - but focus can definitely do what you outlined above. Select classical as a focus, and then tap it again and it inverts (goes red and -). This will now show everything that’s not classical. You can invert all filters the same way - ie to find everything that isn’t 44.1 sample rate, select 44.1 and tap to invert it.

Unless you’re enabling DSP (volume levelling, convolution, EQ, upsampling etc) then it’s bit perfect. It shows in the signal path exactly what it’s doing so you can confirm if your playback setup is bit perfect or not.