Problems with FirstMix I/0 and Mixvibes

Dear all
Sorry if this is in the wrong place!
After reluctantly selling my decks and most vinyl, I thought I'd buy a very cheap little piece of kit to mix on my PC.
I'm having real trouble as I can't get the headphones output on the FirstMix i/o to do anything - the amp plays what's in the 'cue' and the headphones the same.
I imagine this is a soundcard issue, thought the manual does say separate soundcard for master and cue inputs...
Any help for what I am doing? Can always just send it back and get something better!
Thanks lots!
Sorry if this is in the wrong place!
After reluctantly selling my decks and most vinyl, I thought I'd buy a very cheap little piece of kit to mix on my PC.
I'm having real trouble as I can't get the headphones output on the FirstMix i/o to do anything - the amp plays what's in the 'cue' and the headphones the same.
I imagine this is a soundcard issue, thought the manual does say separate soundcard for master and cue inputs...
Any help for what I am doing? Can always just send it back and get something better!


Thanks lots!