I am working on a vowel-synthesis module using ADAU1701 and I have a need to create bandpass filters that have fairly high Q - about 20-30, with center frequencies upto 4kHz. I would like to use an algorithm module that allows for easy realization in the analog domain - such as a state-variable module. I find that most such filter blocks in SigmaStudio do not allow you to create Qs greater than 15 or so. In fact some top out at 10, some at 15 and one or two at 16. Why is there this arbitrary bunch of topouts, and what is the best way for me to create a higher-Q bandpass filter using standard analog-realizable blocks such as State Variable filters?