ESS 1887 & ESS chipsets in general

I have a DEC PC 5500 with an onboard ESS1887 sound chip. The Linux sounddriver recognizes this chip as a 1688 chip.

Though the ESS1887 has several controls for recording levels on WinNT (Mic, Line, Midi...) it has not a single one on Linux. Even the hardware documentation states that these registers exist, but the Linux driver apparently doesn't do anything with them. I managed to patch the driver into having a RECLEV control which controlled the recording level of the CD input, but now I want to know how te make it work in general.

* Are people taking care of this already?
* Who has an ESS chip and cannot control recording levels on Linux too?
* What recording levels do exist on the 1688 chip (on WinNT, Win95 etc.)?
* Can anyone send me the register descriptions of the 1688 chip?
* Please send me register descriptions of whatever ESS soundchips!
* I have some 1887 docu, but it's "preliminary". Can anyone send me more technical documentation about it?
* I looked into the OSS api. I can't figure out how recording levels of in puts are controlled for several devices, independent of "playback" levels. Any Ideas?

Thanks,

Rolf.

Hello,

I am not sure, but maybe the people at oss/free can both help you, and
integrate whatever work you do on the driver so that its available with the Linux kernel.

http://www.opensound.com/ossfree/ossfree.html

^^^
Not an easy subject, I think. (I'm finding
that out too!).

On http://www.bright.net/~dlphilp/linux_soundapps.htm, you might find
interesting links such as : http://web2.airmail.net/sjbaker1/sl/ (the SL Sound and Mixer Libraries.).

Cheers,

Etienne