It would be nice to see the Chebyshev type 2 filter in the standard "crossover line-up" (with -6 dB/n*180 degrees at x-over frequency). Also the following features would be needed: order, attenuation in stopband and number of notches/zeroes in stopband.

Currently, only Butterworth, Bessel and Linkwitz Riley are included. This being said, a simple IIR software tool like "ScopeIIR" (free trial version) will easily compute these biquad coeffs for you. Aka, the whole purpose for us to design the Advanced plug-ins was to give the freedom you need to build any IIR filter.

Hope this helps,

DevTeam