

I don’t know how to do it on Android, but look into variable bit rate (VBR) rather than 320 kb/s. 320 kb/s is a constant bit rate (CBR), and means that silence is given the same quality and detail as the busiest track, and takes up space for no reason.
The highest VBR setting, V0, is indistinguishable from 320, but saves space. Depending on your ears and the phone speakers, you might be able to drop the quality slightly and save more space 👍
I’m gonna eat you little fishy!