Nintendo 1504166 Programming Manual - Page 101
SOUNDCNT_X [d03, d02, d01, d00] Sound Operation Flags, SOUNDCNT_X [d07] All Sounds Operation Flag
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AGB Programming Manual Sound Address 084h Register SOUND CNT_X 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Attributes Initial Value NR52 R/W 0000h All Sounds Operation Flag 0: Halt 1: Operate Sound 1 Operation Flag 0: Halt 1: Operate Sound 2 Operation Flag 0: Halt 1: Operate Sound 3 Operation Flag 0: Halt 1: Operate Sound 4 Operation Flag 0: Halt 1: Operate SOUNDCNT_X [d07] All Sounds Operation Flag The master flag that controls whether sound functions as a whole are operating. A setting of 0 halts all sound functions including direct sound, producing a mute state. In this situation, the contents of all the Sound mode registers are reset. Always set all the sound operation flags to 1 when setting each sound mode register. You cannot set each sound mode register when all the sound is stopped. SOUNDCNT_X [d03, d02, d01, d00] Sound Operation Flags Each sound circuit's status can be referenced. Each sound is set during output, and when in counter mode it is reset after the time passes which was set up with the length data. ©1999 - 2001 Nintendo of America Inc. 101 D.C.N. AGB-06-0001-002B4