Ambimonitor source points link to audio

Hi

I have just started using the ICST.net externals for Max/Msp in an attempt to create a GUI for Sound Design in Theatre spaces.

So far I have successfully managed to create multiple source points in Ambimonitor, and load multiple sound files to the patch. I cannot however directly link a specific sound file to a specific source point.
My latest attempt involved a 'route aed' object to a 'route n' object from the aed output of ambimonitor,
(n= source point number, so far have 1 and 2) each route goes to the second input on a 'p absorption' patch I have which outputs to 'ambiencode', the audio goes to input 1 in the 'p absorption' patch

the 'p absorption' patch takes the inputs to a biquad~ two-pole, two-zero filter, however the coordinates first go through a series of objects:
'zl nth 3'->'clip 0. 1.'->'*17000'->'!-18000'->{input 1}'filtercoeff~ lowpass'{input2}

Does anyone know if I am even close to the right method or am I barking up the wrong tree?

Many Thanks