plotting filter frequency response in GUI

hello!

i am working on a student bachelor thesis, in which i should design a parametric equalizer in matlab/simulink with a gui and then should implement in on a AD target.

but now i have a question:

from my gui i get the values for center frequency, gain and q of each band of the filter. these values go into an embedded matlab function of my simulink model, which calculates the filter coefficients for the band. these coefficients run then into de biquad-block of the dsp-toolbox in simulink.

now i want do show a real-time-plot of the filter-response (for each band and the sum of my three bands in the same plot) from my model, i want to do this with event listeners. so far so good, but how can i plot the filter response out of my coefficients when freqz doesn't work in simulink? which function should i use to plot the freq-response?

thanks & greets,

markus