Larry, I think you're confused about a couple of things.
First, you shouldn't need a PC in the chain. You stream music from the Bluesound Node 2 directly to your Arcam or you can run it to the Pro-Ject DAC via a coax cable and connect the DAC to the Arcam. You may find the Node 2i's DAC is as good or better than the Pro-Ject DAC. Either way, you should be able to get a full unfold of the MQA files.
The Bluesound app will control streaming from music services like Tidal, Qobuz, Radio Paradise, etc. as well as stream music from your home network if you have files that you have shared on your network. The DAC just converts digital signals to analog and passes them to the Arcam. There's nothing to control on the DAC.
First, you shouldn't need a PC in the chain. You stream music from the Bluesound Node 2 directly to your Arcam or you can run it to the Pro-Ject DAC via a coax cable and connect the DAC to the Arcam. You may find the Node 2i's DAC is as good or better than the Pro-Ject DAC. Either way, you should be able to get a full unfold of the MQA files.
The Bluesound app will control streaming from music services like Tidal, Qobuz, Radio Paradise, etc. as well as stream music from your home network if you have files that you have shared on your network. The DAC just converts digital signals to analog and passes them to the Arcam. There's nothing to control on the DAC.