Your English is pretty good.
One of the outputs can be routed in the Prodigy control panel as a headphone output. I conencted them directly to that 3.5mm output. If you don't need multiple channels maybe you should look at the prodigy HD2. you will have to look at this website.
www.audiotrak.jp (Use Google to translate).
Or consider a USB Headphone DAC if you only need it for headphones.