After you open your FC module in Furnace you will see something like this:
We will concentrate on the instrument, samples, speed and the pattern tabs. Let's open "smod_wavetable.it" in OpenMPT
For now we need to prepare our openmpt project (Save As) and setting a correct pattern lenght. So we need to calculate it based on the speed of the FC module, aka How many times you need to click this button