Digital/Digital volume controler

Hi, interested in making a digital volume control with raspberry, screen, coder button, and remote.
I need toslink input, volume control, toslink output.
I plan to use a volume control algorithm wich i already have in C++ and maybe after that (later) an upsampling.
my question is :
should I use digi+ I/O and make processing by the raspberry or use Hifiberry Dac+DSP 

where can I find informations after buying boards



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