There was some previous discussion on this subject:
It seems there is a “DPSK” string inside the uTonic installer, so that is a good starting point. Note that PO-32 uses a low speed monophonic transfer. PO-33/35 uses a high speed stereo transfer.
I stopped looking into this after I realized the difficulty level here. Without help from TE I guess the chance of success is zero (maybe it is possible for the PO-32). I just wish TE would play nice and provide a data transfer library.