Hi,
Just tested on the Android version of Chrome and even there it is working fine.
The miniaudioplayer falls back to the default built in player only on the stock Android browser; on all the other should work fine. I just tested this page:
http://pupunzi.open-lab.com/mb-jquery-components/jquery-mb-miniaudioplayer/
Is it working for you on Chrome mobile?
Bye,
Matteo