Hello, i am Italian. I have a mini MED400X mini but does not work well with .flac music with the Toslink output connected to a DAC 24/192 and aux input amplifier NAD C352. I tried different firmware. Using an external HD WD USB 2.5. The optical signal output is already decoded? To be precise on some songs work and others do not, when this locked on one track then not work with anyone, turn on off and try again. Can you help me, thanks.