Just re-installed app.
Sound is normal now.
Wellllllll.....I am a early Roon adopter with a lifetime purchase..I have HiRez Tidal, I use iTunes for ALAC and I installed Amazon Music last night.  I’ve been using it for a few hours now....My initial impressions are very good.   Selection-excellent, sound quality-excellent (I signed up for UHD), navigation-interface much better than Roon and Tidal.  I don’t like Amazon (the business model) but I gotta say I like this.  Now, I also like Tidal for MQA so I’m not going to doing anything drastic yet...But I’m beginning to have dark thoughts that I could live with one service and Amazon may be it for me....say it ain’t so...RIGHT?
Most will not be hi res.  If they were originally recorded before digital recording, they cannot be high res as the source was not.  Putting them in a high res package, does not improve the resolution.
It works with Bluesound node2
Glad to get rid of Tidal pushing Rap on me.