SCUS MRTA Unload Scenario Music and PlayTunes

00043f00: 27bdffe8 addiu r29,r29,0xffe8
00043f04: afbf0010 sw r31,0x0010(r29)
00043f08: 0c010e8e jal 0x00043a38              SCUS MRTA Set No Forced MUS Playing
00043f0c: 00000000 nop
00043f10: 0c010e70 jal 0x000439c0              SCUS MRTA Unload Scenario MUS (Scenario music 0)
00043f14: 34040001 ori r4,r0,0x0001
00043f18: 0c010e70 jal 0x000439c0              SCUS MRTA Unload Scenario MUS (Scenario music 1)
00043f1c: 34040002 ori r4,r0,0x0002
00043f20: 0c010f60 jal 0x00043d80              SCUS MRTA Set PlayTune Volume (volume == 0)
00043f24: 00002021 addu r4,r0,r0
00043f28: 8fbf0010 lw r31,0x0010(r29)
00043f2c: 27bd0018 addiu r29,r29,0x0018
00043f30: 03e00008 jr r31
00043f34: 00000000 nop