The width of the range according to the principles of the triangle, the better the sound Frequency Wah Wah the longer range of Wah sounds (slow), which we usually assign to Wah Frequency = Fs/10.
The wide range of the triangle to the principle of sound Wah Wah Frequency even more, making the sound of Wah longer (slower), which normally requires that we Wah Frequency = Fs / 10.