Streamer with variable digital output

In my setup, a Bluesound node feeds a Peachtree Gan1 digital amp/power dac. The Gan1 has no volume control and a digital input only. What other streamers have a variable digital output for compatibility with the Gan1? 

BTW, I ask out of curiosity. The Node to Gan1 is a wonderful option for anyone looking for two small boxes and one interconnect for less than $2000. 



Please allow me to reiterate. This is a Gan1 amp/power dac. It has a digital input only.  There are no analog inputs and there is no volume control. I am curious about the existence of streamers with variable digital ouput. Thanks.

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Look into the miniDSP SHD Studio. It has a big volume knob with display and a remote. Most are only controlled via network (only when it's on line) by iOS or Android.