[op25-dev] Correct decoder: op25_decoder_ff.cc or op25_decoder_bf.cc

I am trying to use the OP25 blocks for a C++ program. I have everything running fine as a .GRC. I also have a makefile to bundle everything up into a library. I am confused which C++ blocks I should be using - should it be op25_fsk4_demod_ff.cc connected to op25_decoder_ff.cc ? op25_decoder_ff.h get exported to /usr/include/ however only op25_decoder_bf.cc is included in the Makefile.am There is no op25_fsk_demod_fb.cc so I am not sure how I would connect the decoder_bf block in. What are the correct C++ blocks to use to replicate the "OP25 FSK4 Demod" & "OP25 Deocder" Python Blocks? Are there any C++ programs I could use as an example? Thanks for any pointers! - Luke