Decimation/interpolation filter control from Simulink

Hi,

I was wondering how I can program the on-chip decimation/interpolation filter banks when controlling the AD9361 from Simulink (through iio_sys_obj). It should be possible to use them to implement the pulse shaping filters, instead of using the rrc filter blocks in Simulink (as done here: QPSK Transmit and Receive Example [Analog Devices Wiki])

Thanks,

Aaron