[Discuss-gnuradio] Modulation order of FSK

Hello everyone,

I am trying to implement a text transmission with FSK modulations. I did my research about FSK on GNURadio, but what I found is mostly with binary FSK. I have a problem with designing the flow graph of M-FSK modulation. 

I am implementing the binary FSK with GFSK block and I think it is working correctly. For the next step I want to increase my modulation order of FSK modulation, like 4-FSK and 8-FSK, however, I could not move forward from the file source block. How can I implement the 4-FSK and 8-FSK on GNURadio?

Also if there is a something wrong on my flow graph, please feel free to warn me.

https://imgur.com/a/H0Fqj6E  

Thanks in advance for your interest.

-Batuhan Kaplan