Set up microphones to capture the band's performance. This can be as simple as two microphones in a stereo arrangement, but it does not take advantage of the US-1641's capability. Use four microphones on the drums--one each on the bass drum and snare, with a pair of stereo overhead mics. Route these to inputs one to four on the US-1641. Connect the bass to the direct injection box between bass and amp, and route the XLR output of the box to input five. Place a mic in front of the guitar amp, and route it to input six. Split the singer's microphone signal--routed to both the P.A. and input seven on the US-1641.
Set signal levels for each input on the US-1641 by way of the control knobs for the appropriate input. An LED will light green to indicate the presence of a signal, which will turn red if the signal is too high. Turn the control knob clockwise to boost the signal and counterclockwise to reduce it. If any LEDs flash red, reduce the level on that channel.
Set up and arm tracks within your recording software. Refer to your software instructions for proper setup. Set the Mix control to the "INPUT" position. Connect the headphones to the "Phones" jack on the front of the US-1641, and adjust the "Level" control for a comfortable volume.
Capture the band's performance using your software. The blend of instruments and vocals in your headphones will not be balanced at this point. You want to capture quality signals for each source. Adjusting them will happen at the mixing stage, in your audio software.
Play back the performance by setting the Mix control to "COMPUTER" and clicking "Play" in your software. Adjust the balance of tracks for playback using your level controls. When you have a performance you are happy with, you're ready for the mixing phase.