Plexamp should already ignore songs with low ratings iahend shuffling or using a mix / radio. I believe that’s true for songs rated with 
or stars.
That will however not apply if you tell Plexamp to download an entire album/artist/playlist
is it possible that plex creates a playlist with all songs with one star so I don’t download them.
Does radio works with downloaded songs as well because there is an option to prefer downloaded songs.
Also is it possible to deactivate caching at least on a computer because it doesn’t make sense if the computers is connected to the server anyway.
You can create smart playlists from the Advanced Filter in Plex Web – e.g. excluding certain ratings. I believe Plexamp created a bunch of them on its own such as "Fresh 
" or “ Tracks”… Those will automatically be updated if new songs are added. And yes: you can tell Plex to download one of those – up to the famous 24 hours limit.
As for caching:
Keep in mind… a network isn’t a linear/synchronous thing… apps will always load chunks of data, not x bits of data as your client is playing them in that very second.
That being said… check out the Plexamp settings → Advanced > Caching to optimize to your liking.
I have chosen just the next track.
24 hours is fine.
Will plex amp download also songs what i did not heard so far.
Maybe you two want to switch to German? 
…or us three, actually.
Yes, there is a “unplayed” filter available, so you can build your self a smart playlist with all unplayed tracks.
One last thing. I only can make the playlist with the admin.
I want that for the second user
Each user can/has to make his/her own playlists.
Use the “Switch User” menu item to “become” your other user(s).
(only possible if this user is a “managed” user)
Thank you for your help.
i made a smart playlist with only filters the one star rating out. Plexamp is worth the price of the plex pass alone
