The Altair I don’t believe has any digital outputs does it? If it doesn’t, then you have no choice anyway, otherwise you can’t use Yggy
The Aries Mini I believe only has Coax and Toslink out, so you won’t be able to use the USB input from Yggy with that either. You could use the Coaxial or Toslink outputs however (I recommend Coax). Some say the Coax input sounds better on Yggy anyhow (at least for now until the new USB input is launched at some point), but I think all the inputs are relatively close.
If you want to use the USB input on Yggy then you will need something with a network/wifi input that also has USB digital output - for instance the full Auralic Aries (not the Mini) or something like a Sonore Microrendu or Sotm SMS-200, Allo USBridge etc, etc.