Format of WAVE Audio Services structure:
Offset	Size	Description	)
 00h	4 BYTEs	name of the structure
 04h	DWORD	structure length
 08h 16 BYTEs	for future expansion
---entry points (details???)---
 18h	DWORD	DeviceCheck
		11h compression (see also #00117)
		12h driver state
		13h get current pos
		14h sample rate
		15h set preference
		16h get DMA,IRQ
		17h get IO address
		18h get mem address
		19h get mem free
		1Ah full duplex
		1Bh get block size
		1Ch get PCM format
		1Dh enable PCM format
		80h-.. vendors can add DevChks above 0x80
 1Ch	DWORD	PCMInfo
 20h	DWORD	PlayBlock
 24h	DWORD	PlayCont
 28h	DWORD	RecordBlock
 2Ch	DWORD	RecordCont
 30h	DWORD	PauseIO
 34h	DWORD	ResumeIO
 38h	DWORD	StopIO
 3Ch	DWORD	WavePrepare
 40h	DWORD	WaveRegister
 44h	DWORD	GetLastError
		01h unsupported feature/function
		02h bad sample rate
		03h bad block length
		04h bad block address
		05h app. missed an IRQ
		06h don't understand the PCM size/format
		80h-.. vendors specific errors
 48h	DWORD	TimerTick
 4Ch	DWORD	ApplPSyncCB: CallBack: play filled in by the app
 50h	DWORD	ApplRSyncCB: CallBack: rec filled in by the app
SeeAlso: #00120,#00124