The path for the AUD.ini file should be:
 
C:\Users\Your User Name\AppData\Roaming\Cakewalk\SONAR X3 Producer
 
Sub X2 for X3 if that's what you are looking for.
 
Please note that the folder is actually hidden, so make sure you adjust your View options to display hidden folders.
 
Bob Bone
 

Yes, the path to AUD.ini is hidden, AppData is a hidden directory in your user directory. One way to reset the AUD.ini and all the other init files and user data is holding the CTRL and SHIFT keys when starting SONAR. This "re-personalizes" SONAR, overwriting all of the user data in "C:\Your User Directory\AppData\Roaming\Cakewalk\Your Version of SONAR" with the master copy in "C:\ProgramData\Cakewalk\Your Version of SONAR" and fixes some registry entries.

Found the AUD.INI file, reset it.  Thought I would find a drum track and learn how to use these things when it hung again. I was changing programs in "Session Drummer" and sonar stopped responding. This is the log from that event.
 
 
 
Log Name:      Application
Source:        Application Hang
Date:          12/1/2013 11:28:35 AM
Event ID:      1002
Task Category: (101)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Jams-PC
Description:
The program SONARX3.exe version 20.0.3.223 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
 Process ID: a04
 Start Time: 01ceeeb9221af0f1
 Termination Time: 32
 Application Path: C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe
 Report Id: f825608d-5aad-11e3-904e-20aa4b6219d2
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Hang" />
    <EventID Qualifiers="0">1002</EventID>
    <Level>2</Level>
    <Task>101</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-12-01T17:28:35.000000000Z" />
    <EventRecordID>13910</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Jams-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>SONARX3.exe</Data>
    <Data>20.0.3.223</Data>
    <Data>a04</Data>
    <Data>01ceeeb9221af0f1</Data>
    <Data>32</Data>
    <Data>C:\Program Files\Cakewalk\SONAR X3\SONARX3.exe</Data>
    <Data>f825608d-5aad-11e3-904e-20aa4b6219d2</Data>
    <Binary>430072006F00730073002D0074006800720065006100640000000000</Binary>
  </EventData>
</Event>

Others may have better ideas but from my perspective I think I've exhausted this. Send the crash dump to sonar and send them an email if I were you...
 
Over to the rest of the gang who may have something more interesting things to say....
I would reread the thread again as well just in case...
 
You did try this and run windows update?
 http://forum.cakewalk.com/Driver-Boost-m2928792.aspx
 
 
Sorry

Is it possible you have antivirus software running while trying to use Sonar?
 
If so, just for testing purposes, can you try temporarily suspending any antivirus software and launching Sonar again?  Before you do any of that, please get a clean boot, and then try the above test.
 
According to Microsoft, this error is fairly generic, but I did see a brief comment where one of their techs had indicated to someone that it can sometimes be caused by antivirus software interplay with applications that are executing.
 
Should be fairly easy to test.
 
Edited to remove question on your specs I reread and answered my own question.
 
Thanks, 
 
Bob Bone
 

Yes, the driver update was done, and I checked the windows update as well. Antivirus cont. to be suspended.
 I will send the dump to Cakewalk and see. Thanks again for everyone's help. All is appreciated more than you will ever know. Dearly thanking all for time spent, input and patience. I learned a lot, still with the understanding of how much is to learn, (a little breathtaking at the amount).Thanks again guys!

Keep us updated... Further ideas might spring up (bump the thread if you like).
 
Cheers...

@OP
 
Your machine should have no issues running other software at the same time as X3c, period. One thing that stuck out to me during this thread is your error post, which had this line in it:
 
Faulting module path: C:\Windows\SysWOW64\ntdll.dll
 
This is a Win7 file issue that can occur for a few reasons. You can google "ntdll.dll errors" and only read links on Microsoft community sites (i.e. valid threads). Below are a couple good links which discuss that file and checks/solutions to fix it:
 
http://answers.microsoft.com/en-us/office/forum/office_xp-outlook/how-to-fix-ntdlldll-error/9e455b5a-cc9d-4724-9eb1-ecbd755366b2
 
http://answers.microsoft.com/en-us/windows/forum/windows_7-system/ntdlldll-error/650a3853-7287-4aef-a41f-f0ed227ab8eb
 
The "best answers" to both of these posts have some simple steps to check the root cause/solve this issue.
 
Rather than have you chasing "phantoms" around, the "Faulting module path" is the "root cause" of the one thread you posted earlier.
 
"Faulting application name: NetSvcHelp.exe, version: 1.0.0.1, time stamp: 0x50223ca5
Faulting module name: ntdll.dll, version: 6.1.7601.18247, time stamp: 0x521ea8e7
Exception code: 0xc0000005"
 
Yes, the application it faulted on was AI Suite II (which I also run full time), but the module is windows (i.e. global). One common key to ntdll.dll, and Exception code: 0xc0000005 is "Microsoft Outlook"... does that startup on its own when you boot your computer?

>Faulting module path: C:\Windows\SysWOW64\ntdll.dll
 
If you look at the line above : C:\Program Files (x86)\ASUS\AI Suite II\Network iControl\NetSvcHelp\NetSvcHelp.exe
 
.. which was discussed earlier in the thread...
 
Cheers..

Yes, thank mett and Alex, I had disabled/removed the AI software (and now my fans sound like thunder freezing my CPU and board), but nonetheless I understand necessity of ruling out all I can. I will read the threads. I do not use outlook that I am aware of. That is an email program of microsofts right? I use a mozilla product. I'll look and see to make sure it's not there. Thanks again!
(By the way, cakewalks tech support email is not functioning right now...)