Lower Octave

00015a28: 94c2007e lhu r2,0x007e(r6)             load current octave
00015a2c: 00000000 nop
00015a30: 2442fff4 addiu r2,r2,0xfff4            -12
00015a34: a4c2007e sh r2,0x007e(r6)              store octave
00015a38: 03e00008 jr r31
00015a3c: 00801021 addu r2,r4,r0