Volumio & J-River

Hi all,

I have a I2s Mano Music Streamer (Magna Hifi)
A 3d Lab Nano Dac (I2s Input)
Volumio on My Streamer (last release)
J-River on my computer (DNLA solution)

How can I find a gapless solution for my media library ?
My dac Is DoP 64 ok with the I2s Input but i never succeed to turn DSD on properly.

How can I sort things out with Volumio settings and J-River settings to enable DoP playback and resolve gapless problem.

Many thanks for your help.