Change the rate from default 2 to 3

I am stuck with how to change the rate from default 2 to 3... 

The example given in the Wiki manual works fine to double frames:

SetMemoryMax(1024)
   LoadPlugin("svpflow1.dll")
   LoadPlugin("svpflow2.dll")
   
   threads=9
   SetMTMode(3,threads)
   # Some input here
   SetMTMode(2)
   ConvertToYV12()
   
   # All parameters set to defaults which means high quality frame doubling
   super=SVSuper("{gpu:1}")
   vectors=SVAnalyse(super, "{}")
   SVSmoothFps(super, vectors, "{}", mt=threads)

But how do I get it to triple frames instead of doubling? I have tried many syntaxes, with no result...

Can anyone help?