I don't know what you are doing to these files, but I can't open them with any plist editor.
Hehe, have you tried a simple text editor? Would a .doc file do?
Here's a thought ...
Do you need a "-" infront of "alcid=18"? I think not.
Remove it, reboot. See what happens.
I did remove it and it is the same.
However during the verbose boot, I see that alcid= 18 appears first, but down later it reapears with number2.
So taking a look I saw firts thisarguments:
On line 172
<key>Arguments</key>
<string>-alcbeta shikigva=1 -lilubetaall keepsyms=1 -disablegfxfirmware -wegbeta -no_compat_check -alcid=18 -v</string>
<key>Debug</key>
And on line 197 I see this.
<key>Audio</key>
<dict>
<key>AFGLowPowerState</key>
<false/>
<key>Inject</key>
<integer>2</integer>
<key>ResetHDA</key>
<false/>
</dict>
I am not a programmer but I don't know if that is the alcid number 2 that I see appearing.
Thanks!