change the
#define USE_MP3_REFILL_MEANS USE_MP3_INTx
to
#define USE_MP3_REFILL_MEANS USE_MP3_Polled
in SFEMP3ShieldConfig.h
as per the instructions
Did you get the VS1063 going?
I was interested in adding this to the library. Got a chip and just never replaced the one my Shield.