No sound when playing DSF file through SOTM -sms100 and AUdio-GD DAC NFB-7

[Themask]

Hi everybody,

I need help to setup my systems based on SOTM-sms 100 feeding an Audio-GD NFB Dac by USB. The dac is with ESS Sabre 9018 DSD capable.
Playing PCM files is trouble free, but if I try a dsf file, I can see that the file is played but there is no sound!
I have tried with Logitech Media Server 7.9 with the DSD player plugin activated and the file type sate to native and dsdplay on LMS server side. On the SOTM side I have tried different values for the buffer and period count with squeeze lite activated without success :-(

I have also tried with minimserver combined with minimstreamer and the parameters dsf:dopwav and dff:dopwav, still no sound with dsf files.
What am I missing?
After few testing found that you can hear the sound but the volume level is very very low!Even to hear this, I have to almost set the volume knob on the preamp to the max and put ms ears very close to the speakers! Weird!
I have attached 2 log files, if they can help. these error messages are repeated in the entire log file
Thanks in advance

Serge