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.
Try this:
Capture Hardware
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.