Put 8 standard 12 dB/Oct low pass filters after each other with the same frequency, and you will get the 96 dB/Oct filter

Thanks! I've tried it, but when multiple filters being used together, it sharpens the peak that normally caused by high Q value. What should I do to keep the sharpness (or ...

In FabFilter Pro-Q, low-pass (or high-pass ) filters could have Q-value even for those order >2. However, all common IIR design methods I know (such as Elliptic, Butterworth, Chebyshev I and II) don't have such property. So does anyone know some IIR design method that has similar property with the ...