Hello CL91,
Try using a state-variable (Q/F Input) filter as shown below. You'll find it under Miscellaneous Filters. Help for this filter block is found at
http://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/filters/statevariableqfinput
As shown here, the pot on your -1701 eval board adjusts the filter's frequency. For this to work you'll need to set MP8 in your project's Hardware Configuration / Register Control window to ADC3:
Once you have the filter working you're free to mix in the original signal and sweep the frequency with an oscillator, etc.. Have fun!
Best regards,
Bob