Bob, I use Studio 7.1 and I just go to capture and it searches for any device attached to the computer. It doesn't matter if its Firewire or USB.
Studio can capture analog and digital video from the following sources, depending on your hardware:
A DV or Digital8 camcorder connected to a Pinnacle Studio DV or other 1394 port
A camcorder or VCR connected to a Pinnacle Studio DC10plus or Pinnacle Studio AV
A camcorder or VCR connected to a Pinnacle USB Video Capture Cable or other DirectShow compatible video capture device.
A camcorder or VCR connected to a Pinnacle PCTV or other TV-Tuner PCI board
USB video cameras or webcams
To select the video capture device you wish to use:
1. Click the Settings button .
2. Select the Capture Source tab .
3. Select the capture device from the drop-down list and click OK .
The controls and options displayed in Capture mode vary depending on the capture hardware you select. If you are using a DV camcorder connected to a 1394 port, please refer to to the section headed DV Capture Options immediately below.
If you are using an analog device with either a composite video or S-Video input to your hardware, please refer to Non-DV Capture in this section.
BTW, this is all located in the help section.