This is a port of the ESP8266 port of LIBMAD with the ultra-low-memory
optimizations removed.  This will generate all 1152 samples per pass,
and has been modified from stock to interleave those synth()d samples
so they're directly usable in I2S or PWM.
-Earle F. Philhower, III
 <earlephilhower@yahoo.com>
