Creative SB0350 Hardware Programming Guide - Page 74

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4-16 Mixer Chip Programming Registers 0x38/0x39 (Line volume .L/.R) Register 0x3A (Mic volume) 5 bits per channel, giving 32 levels. 0 to 31 ⇒ - 62 dB to 0 dB, in 2 dB steps. Default is 0 ⇒ - 62 dB. Register 0x3B (PC Speaker volume) 2 bits, giving 4 levels. 0 to 3 ⇒ - 18 dB to 0 dB, in 6 dB steps. Default is 0 ⇒ - 18 dB. Register 0x3C (Output mixer switches) Set the appropriate bit to 1 to close the switch, 0 to open. The default is Line.L 1 Line.R 1 CD.L 1 CD.R 1 Mic 1 Register 0x3D (Input Mixer.L switches) Set the appropriate bit to 1 to close the switch, 0 to open. The default is MIDI.L 0 MIDI.R 0 Line.L 1 Line.R 0 CD.L 1 CD.R 0 Mic 1 Register 0x3E (Input Mixer.R switches) Set the appropriate bit to 1 to close the switch, 0 to open. The default is MIDI.L 0 MIDI.R 0 Line.L 0 Line.R 1 CD.L 0 CD.R 1 Mic 1 When recording in mono, note that samples will only be taken from the left input mixer. So, if a mono recording of a stereo source is desired, the switches controlled by registers 0x3D and 0x3E must be manipulated to enable both channels of a stereo source to be mixed together first into the left input mixer before being sampled.

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4-16
Mixer Chip Programming
Registers 0x38/0x39 (Line volume .L/.R)
Register
0x3A (Mic volume)
5 bits per channel, giving 32 levels.
0 to 31
⇒
–
62 dB to 0 dB, in 2 dB steps.
Default is 0
⇒
–
62 dB.
Register 0x3B (PC Speaker volume)
2 bits, giving 4 levels.
0 to 3
⇒
–
18 dB to 0 dB, in 6 dB steps.
Default is 0
⇒
–
18 dB.
Register 0x3C (Output mixer switches)
Set the appropriate bit to 1 to close the switch, 0 to open.
The default is
Line.L
Line.R
CD.L
CD.R
Mic
1
1
1
1
1
Register 0x3D (Input Mixer.L switches)
Set the appropriate bit to 1 to close the switch, 0 to open.
The default is
MIDI.L
MIDI.R
Line.L
Line.R
CD.L
CD.R
Mic
0
0
1
0
1
0
1
Register 0x3E (Input Mixer.R switches)
Set the appropriate bit to 1 to close the switch, 0 to open.
The default is
MIDI.L
MIDI.R
Line.L
Line.R
CD.L
CD.R
Mic
0
0
0
1
0
1
1
When recording in mono, note that samples will only be taken from
the left input mixer.
So, if a mono recording of a stereo source is desired, the switches
controlled by registers
0x3D
and
0x3E
must be manipulated to
enable both channels of a stereo source to be mixed together first
into the left input mixer before being sampled.