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Technologies, Inc.
Revision 2.4, May 28, 2002
4 - 13
Hardware Interfaces & Interface Registers
VT1712 - PCI Multi-Channel Audio Controller
CCI03: Playback Left Volume / Pan
Index: 03h
Default Value: 07h
CCI04: Playback Right Volume / Pan
Index: 04h
Default Value: 07h
CCI05: Soft Volume / Mute Control
Index: 05h
Default Value: 05h (about 6.4ms from 0 to 96dB)
Bit
Attribute
Description
7:6
R00b
-
5:0
R/W
Left stream volume: 1.5dB attenuation per step. Default: -10.5dB
000000: 0dB
....
000111 : 10.5 dB (default)
....
011111: -46.5dB
111111: muted (instead of -94.5dB)
Bit
Attribute
Description
7:6
R00b
-
5:0
R/W
Right stream volume:1.5dB attenuation per step. Default: -10.5dB
000000: 0dB
....
000111 -10.5 dB (default)
....
011111: -46.5dB
111111: muted (instead of -94.5dB)
Bit
Attribute
Description
7:0
R/W
Soft volume update rate (48 KHz/[CCI05], about every 20
µs*[CCI05] per 1.5dB step).
These bits apply to all the DirectSound channels 0 through D as well.
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