I think you'll still need to use the special fork they have with the download. If you look in the installation directory you should see the special version of cgminer.
Then I looked at where it installed it on my machine:
C:\Program Files (x86)\Broadeng\DualMiner
In there should be a directory called:
cgminer-win-32bit-2014-01-24_154358
That's the version, that I used to get it to work from command line.
To make it easy, I just modified one of the existing batch files which was already there
cgminer.exe --scrypt --lo -o stratum+tcp://us-east.multipool.us:7777 -u dmpotter.dual -p x -S //./COM22 -S //./COM23 -S //./COM24 -S //./COM25 -S //./COM26 -S //./COM27
I am not able to get this to work. I also tried:
cgminer.exe --scrypt --lo -o : -u . -p 1 --dualminer-pll 400 -S //./COM50
Can you do " -S all "?
You cannot do '-S all'. However the GUI allows an "ALL" feature.
Are you sure you have the right COM port? There will be two that show up. To verify which one is which you can
run the gui in LTC only mode and see the output of cgminer to see what COM ports it shows up as working.
Also I didn't use the --dualminer-pll option.