Hello:
I found a solution to the problem listed elsewhere (and here) as SoundMax Input Audio Monitor or Missing "EnableInputMonitor" registry setting. I have an HP NC8430 (HP Business Notebook) originally purchased with Windows XP Pro, and later upgraded to Vista Business. My microphone also functioned properly in Windows XP, but to my chagrin, there was no documented way to enable the input audio monitor. As it turns out, there was apparently a group of people colluding in secret (recording industry and and other large notebook manufactures) to limit copying of music... best I can tell because this functionality turned out to be DELIBERATELY disabled in my notebook's driver setup... read on.
I downloaded and installed the Soundmax driver's from HP's web site thinking that the new driver would solve my similar problem (no input audio monitor so I could play Karaoke) ... I was in for a journey!!
I tried all sorts of fixes wherever I found a solution posted, the closest thing I found and the thing that led me to own fix was in this thread: http://www.notebookforums.com/thread193323.html
which starts:
"Well I don't know if this applies to Vista but here is how I solved the problem with my XP installation on an IBM that had no Stereo Mix on the record side, only Mic in.
Basically the software (driver) is built to do everything including Stereo Mix . They are all that way. Well most of them are as it's much easier to design a driver to do everything and then disable functions in a config file. Redesigning a driver is very expensive. Disabling the Stereo Mix is a requirement that is artificially imposed so you don't capture (steal) audio streams. "
First, my solution assumes that anyone searching for it has already read a whole freaking lot about this problem and is familiar with ALL of the other proposed solutions, and therefore doesn't cover everything (like where in the sound control panel you would enable the microphone, etc) just what I did to get mine working.
I downloaded and extracted Soundmax the driver from the HP site, opened the ADIHdAud.inf file in the i386 directory, and armed with the knowledge that these settings were most likely present in the .inf file and that they would be intentionally disabled, searched for the term "disable".
Low and behold, at line 597 was section "HpMobileCommon.AddReg", and lines 601 & 602 read:
HKR,AD1981\\Disable, "MonR", 1, 01 ; Disable Mono Out Record
HKR,AD1981\\Disable, "MicV", 1, 01 ; Disable Microphone Playback
which I simply commented out using semi colon:
;HKR,AD1981\\Disable, "MonR", 1, 01 ; Disable Mono Out Record
;HKR,AD1981\\Disable, "MicV", 1, 01 ; Disable Microphone Playback
Then, lines 604 & 605:
HKR,AD1981, MicR, 1, 0B; Set Mic Record Slider
HKR,AD1981, LinR, 1, 0B; Set Line In Record Slider
I changed to:
HKR,AD1981, MicR, 1, 01; Set Mic Record Slider
HKR,AD1981, LinR, 1, 01; Set Line In Record Slider
After making the above modifications, I reinstalled the audio driver, and whallaH! the Microphone Slider magically appeared (muted) on the Speakers => Levels tab!!!! After simply unmuting the microphone (a little button next to the slider) ... I was able to sing my heart out... (by myself thank you!) ...
I started this last night (Sat evening) at 4:30 PM hoping to bring my laptop to my friend's party for some Karaoke fun, and spent 1.5 hours on it with no luck. I started working on this again at 9:00 AM this morning... called HP Technical support (who were completely and totally utterly USELESS!!!!!) and spent an hour and a half having to repeat myself and talk sloooooowwwly and clearly over and over and over and over again answering the same stupid questions over and over... At my wits end, I gave up and went shopping with my friend.
When I got back and refreshed enough, I spent another 2 or so hours this evening on the solution.
My pain is your gain.