epic lt multipanel v`s fsx truetrak autopilot

Can any one with some experience of fsx and multipanel able to explain to me why when using the multipanel (autopilot) with spad , Im not able to set the intersect angle to catch a radial from a vor, like you can if using the fsx truetrak system on the epic lt. when the multipanel through spad is turned off. Seems to me this £100 plus panel doesnt simulate the epic autopilot as well as I had hoped.