I forgot one important thing. If you have modded UA5 for standalone use, the usb is not working, it is cut off. (Original UA5 cannot work as standalone preamp, you must always connect it to the computer via usb.)
There is a possibility that the mod can be switched off using a switch. That's how my modded UA5 is made. When I go to tape, I turn on the switch and I use UA5 without a computer (microphones-> UA5-> recorder). When I use UA5 with a computer I turn off the mod and I use usb (PC-> usb-> UA5-> trs/phones out-> monitors/headphones). But if you have non switchable mod you cannot connect UA5 to a computer or a self phone.