It is possible to cascade multiple types of Hi or Lo Pass filters in the Multifilter. This will produce a result, especially if both filters are set for the same frequency. If one of those filter is (for example) is an IIR filter type and the other is an FIR filter type and the IIR is set for Butterworth, the result will not be a maximally flat passband. That is not to say that the result may not be useful in your application, but it is important to realize that such a hybrid filter produces a non-defined passband ripple.
Craig
Craig