The FireStudio family interfaces and the FirePod/FP use two different drivers and so cannot be used together on the same system.
1) The FP10/Firepod is a device that utilized the BridgeCo chip vs the Dice Chip on the Project - which makes them incompatible
2) The FP10/Firepod out-dates the Project by many years, is discontinued and was replaced with the Project
3) The PF10/Fiepod uses a completely different driver and firmware than the Project, which again makes chaining them together impossible.
If you take a look at page 34 of the manual for the FSProject :
You will see clearly the options for what can be chained to the FSProject.
These articles show you how to link multiple FP10/Firepods: