popelscan and dac

can i use a usb audio dac with popelscan?

"Supported DACs for laser show output are EasyLase and bILDA."

It should with DrLava's hacked EzAudDac DLL...

Does somebody know how to setup Popelscan 4.2 to work with EzaudDac?

popelscan is primairly made for the LPT dac.
I haven't heard of it being compatible with any other dac.
But if what Xer0 says is correct then yes it will work.
Just rename the ezaudio.dll or to Easylase.dll
and replace the one in the popelscan directory.