Here are two example projects which contains all the plug-ins and routing necessary to make an Ambisonic Mix of your material.  Those with 8 at the end are setup to use 8 speakers in an octagon.  Otherwise, it's setup for the 24 speakers.

AmbisonicsTemplatePolar uses the panners where the position is set as a horizontal angle
AmbsionicsTemplateXY uses the panners where the position is set by dragging a 'puck' around on an XY graph. 

enjoy

Bruce