This modified Windows XP driver is for the MacBook Pro's (MC118LL/A) 
Cirrus Logic CS4206 audio device, addressing the output volume issues
as described in http://discussions.apple.com/thread.jspa?threadID=2037093

-- Summary of Changes --

This driver is a modification of clhdaud.sys version 1.0.0.13:

  * Enables the third (midrange) speaker in the MacBook Pro.
  * Removes the -16dB volume limit on the speakers, and applies 
    it to the headphone output instead.
  * The "No S/PDIF" variant disables S/PDIF optical output.
  * Fixes oversampling of audio recording for most
    sample rates (except 48 kHz 16-bit Mono) (Nov 1, 2009, 1.0.0.13c)
    1.0.0.13b breaks 96 kHz instead of 48 kHz.

-- Installation --

There are two variants of the driver:

  * Cirrus Logic High Definition Audio [MacBook]
  * Cirrus Logic High Definition Audio [MacBook, No S/PDIF Out]

Both versions enable the midrange speaker and corrects the volume.
The "No S/PDIF" version also disables the S/PDIF optical output.

Installation of the modified driver follows standard procedure: 
In Device Manager, Update Driver for the Cirrus Logic High Definition
Audio device. Don't let Windows search for or do anything automatically.
Manually choose to the driver from a list, and use the "Have Disk..." button. 
This driver is not signed, as it is a modification of a signed driver.


Fixes for Macbook Pro MC118LL/A by Henry Wong <henry@stuffedcow.net>
http://www.stuffedcow.net/macbook_audio