Hy,
Project is almost finished.
When done I will post finished code, schematic, video of radio in action.
About the module (I`m using BT401)
I am very satisfied with the sound quality, only problem I have is small amount of digital noise on audio lines when using bluetooth. Will try to solve that.
Another thing that bothers me is limit of filenames... no spaces or special characters can be in the name, there is also lenght limit (didnt do the test for actual lenght yet).
Example of song name would look like: ARTIST_-_SONG_NAME
I had ordered 3 BT401 modules from Germany.