Installation was easy and didn't require the manual at all. Everything is self explanatory.
The UB1222FX-Pro Eurorack connects to a PC by connecting the Tape Out connectors to the Line In connector of the PC with an appropriate cable (RCA to stereo mini plug).
Instruments and Mic's connect to the input jacks using balanced or unbalanced cables. Each Jack has a gain control to set the input to appropriate levels.
No real limitations. It does what it claims. Some of the FX are Ok, some not so much.