I've done an audio layout too in my last project, but in order to keep the ground loop as low as possible, it's best to connect all the audio components in ground groups. At last connect them via a single ground trace to the main ground. Also, try to keep the distance between the grounds.
My suggestion: On the bottom layer, a single and seperated pour for the audio analog ground. Distance (1mm?) inbetween the analog ground and the digital ground.
-Seperate analog & digital supply using ferrite bead in the supply rails
-Single ground connection between digital & analog
I've included how I've done this (still needs to be tested, waiting for boards):