Fragment synthesis engine is now available for the Raspberry Pi, it is downloadable from the homepage, it can play up to ~700 oscillators simultaneously at the moment without any interruptions, this is near the capability of the Ans synthesizer with an optimized Raspbian Lite system, it only use two cores right now and further optimizations will permit all the cores to be used to increase the number of oscillators.
You cannot connect to the Raspberry Pi yet because Fragment does not allow the possibility to defined the address of the external synthesis program, this will be added in the next release, be patient please.
Here is a video, the sound is generated from the Raspberry Pi, a HiFiBerry DAC+ is used to output the audio to my computer, Renoise DAW is used for additional fx and to show how Fragment can be used as a virtual instrument :
https://www.youtube.com/watch?v=7x9S0sCz2GU
I plan to do more a bit more with all of this 
