if I had to guess for a starting point for a 2' long tank I would say 4 sec off and 3 secs on (based on the published humbers for 3' or greater tanks).
So the statements would then be
Pmp OSC 04/03/00 for PF1
Pmp OSC 00/03/04 for PF2
But you would need to test that. And for smaller waves you would definitely want to reduce the Intensity, but I couldn't guess to what, but I suppose a good starting point would be 70 percentage max ?
So
Pmp Int 030/070 for PF1
and
Pmp Int 030/070 for PF2
Although I think you can take the Tunze's all the way to 000 when using them in a wave/pulse function. I saw several posts about this further back in this thread, yet I still see example statements from others and Neptune that use 30% as the bottom end, even on a puls/wave statement.
Another way for smaller waves is to double up the frequency for your tank, giving twice as many, smaller waves than if you ran at the actual resonant. So if tweaking the OSC and INT statements above don't give you what you need, try these OSC statements (using the resonant times for a 4' tank, basically double yours) *from the AquaSurf 1.0c Manual*
Pmp OSC 08/08/00 for PF1
Pmp OSC 00/08/08 for PF2
You may still need to tweak the on times (the middle #) down to 7 seconds, it is hard to tell, you will just need to experiment a little. And this is all assuming I read everything correctly about being able to double up the frequency. Let me know if you try it how it works out for you.
thanks again tom 
