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. 


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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.

What am I missing here? The Node has a volume control for exactly what is being asked, both on the face of the unit and also in the software on phone or tablet.