Need help with my Mark Levinson 526 pre-amp

I'll second that about ML's customer service. It's so so bad. I have a full ML setup (including the 523 & the 519 that was released in 2017 or '18 I think). They don't know their product line at all. I had remarked while on a call with ML CS that I found it odd that the 519 had disappeared from their website. I mentioned it because I thought for sure it was a web publishing error. The guy I spoke with was so dismissive and rude and suggested I had no clue what I was talking about. He said, yeah it's not there because it too old and discontinued.  Of course if you look at the ML website today, the 519 is still visible. I was told the 519 was old old product released in 2014 and discontinued . This is the answer I got in late 2019. Guy was a dork!!! 

Sounds like total BS to me. I demo’d a No526 and fed it from my Aurender N100H which also uses a Linux system. It worked fine but I didn’t like the sound of the dac so I went with the 523 and separate Dac. Their customer service is lacking. 
George 

Sounds like a job for Raspberry Pi 4.