«  Excellent! »

I confirm the two previous opinions, Pedal SP-2 from M-Audio is a very good pedal. I had the Yamaha FC4 particular, and a pedal similar to the phase inverter with SP2 (which you can connect this type of pedal on ALL keyboards and synths), M-Audio has the huge plus: its weight! It is heavy enough, is guaranteed not to escape from under the feet when you use it, which is not the case for two other models I've owned. She also has a "feel" close to a real piano pedal, which is nice.
In short, the foot might say!
I remake that choice without hesitation.