1, insert a GigaPulse instance and select New... from the file menu button
2, specify a name for your .iis file in the dialog
3, select the appropriate ticks in the middle (LFront, RFront, and others if you are in surround)
4, push on the Add button
5, select the tick "enable this source placement"
6, specify a name for the source placement
7, in the middle, push the "..." button to insert the wave files to the "LF" and to the "RF" channels, answer the arising question if you selected a stereo file
8, push "Done"
9, select "Done" again and specify a file name
10, select a bank file name
11, specify a Preset name
12, select OK and you are done
you may also fill in some other fields between step 1 and 7, these were just the minimal settings to get things work.