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Avance Logic Inc.
ALS300
13
1
1
external line-in (MX3D = 10h, MX3E = 08h)
Write to input source will update MX3D and MX3E input mixer left/right control register and 2 dummy
bits. Read from input source register will return 2 dummy bits.
MX0E
digital audio output control
Default 00h
Bit 7,6
reserved
Bit 5
output filter enable
Bit 4..2
reserved
Bit 1
stereo switch
Bit 0
reserved
Output filter enable is dummy read/write bit for Sound Blaster Pro compatibility.
Output filter enable: 0 - output low-pass filter on, 1 - off
Stereo switch: 1 - stereo output, 0 - mono output
Stereo switch is not used in ESP command BXh and CXh.
MX22
master left/right volume
Ghost register
Write
Bit 7
MX30.7
Bit 6
MX30.6
Bit 5
MX30.5
Bit 4
MX30.4
Bit 3
MX31.7
Bit 2
MX31.6
Bit 1
MX31.5
Bit 0
MX31.4
Bit 7
MX30.3
Bit 3
MX31.3
Read
Bit 7
MX30.7
Bit 6
MX30.6
Bit 5
MX30.5
Bit 4
MX30.4
Bit 3
MX31.7
Bit 2
MX31.6
Bit 1
MX31.5
Bit 0
MX31.4
Bit 7..4
0 to 15, master left volume in 3 dB step
Bit 3..0
0 to 15, master right volume in 3 dB step
0
-45 dB (off)
15
0 dB (maximum volume)
MX24
digital audio left/right volume
Same as MX04
MX26
music left/right volume
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