Alright, I think I can explain the controller a bit better. You don't have the wave optimized for the length of your tank. You have to change the pulse duration to get the maximum wave based on length of the tank. I can get a huge wave going in my 3 foot long tank with this little thing. Ok, so in W1, the knob controls the pulse length. Keep turning it a tiny bit at a time and watch the wave until you get the maximum or desired wave. Then you hold speed lock for 5 seconds and it locks that setting so you don't have to worry about bumping the knob. To unlock it, hold it for 5 seconds again. Separately from the pulse length, you can also control the flow rate. To do that just press speed (don't hold) and it will toggle between S1 (100%), S2 (75%), and S3 (50%).
W2 and W3 are different wave modes with variable flow rates that you can't adjust, but you can still adjust the pulse duration. W2 is going to be a wave with a set pulse duration but the flow rate will ramp up and down, with more time spent at higher flow rates. W3 is the same but with more time spent at lower flow rates.
Breakdown of the other modes:
H1: Constant at 100% flow
H2: Constant at 75% flow
H3: Constant at 50% flow
Else: Reef Stream mode. Random flow like Reef Crest on an MP10 (this is the setting I use on mine).
To go into feed mode, press and hold "Mode/Feed" for 5 seconds. It lowers the flow rate for 10 minutes for feeding.
Hope that helps!