Names the iC-MU chip from HARD_REV (register 0x74). From the iC-MU150 on, the upper nibble names the chip;
the upper nibble 0 covers the plain iC-MU, 0x05 to 0x07, and the iC-MU128, 0x09 and 0x0A, as the iC-Haus
library (MU_3SL_defs.h) and Motion Master name them.
Names the iC-MU chip from
HARD_REV(register 0x74). From the iC-MU150 on, the upper nibble names the chip; the upper nibble 0 covers the plain iC-MU, 0x05 to 0x07, and the iC-MU128, 0x09 and 0x0A, as the iC-Haus library (MU_3SL_defs.h) and Motion Master name them.