How to display the cascaded frequency response of multistage-multirate filters when cumulative rate change factor of the interpolators following decimators do not equal the cumulative rate change factors of the decimators?

I am trying to visualize the frequency response of a cascaded filter with decimators, lpf,then interpolators (ie, decimate by 8, low pass filter, then interpolate by 4) by designing the individual stages then cascading. However FVTOOL has the following error:

Error using mfilt.cascade/validateratechangefactors (line 45)

Analysis of multistage-multirate filters in which interpolators follow decimators is not supported unless the cumulative rate change factors of the interpolators is equal to the cumulative rate change factors of the decimators.

Is there anyway around this without having to add in another interpolator stage?

Thanks in advance!

[Trung Nguyen-duy]

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