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Format of Volume Services Structure

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Offset

Size

Description

00h

4 BYTEs

name of the structure ("VOLS")

04h

DWORD

structure length (00000038h)

08h

16 BYTEs

16 bytes for future expansion (0)

entry points (details ???)

18h

DWORD

device check

0011h	filter range
0012h	filter setting
0013h	filter current
0014h	tone range
0015h	tone setting
0016h	tone current
0017h	path
0018h	get IO address
0080h - ...	vendors can add DevChks above 0x80

1Ch

DWORD

set vol to an absolute setting

01h	User master volume setting
02h	application master volume setting

20h

DWORD

set 3D volume

24h

DWORD

tone control

28h

DWORD

filter control

2Ch

DWORD

output path

30h

DWORD

reset channel

34h

DWORD

get last error

01h	unsupported feature/function
02h	out of range parameter value
80h - ...	vendor-specific errors

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