Stereophile just tested a Chord M Scaler and in the process tried it with the ML 30.6 DAC. As part of that they talked about how that DAC has stood the test of time and how the M Scaler helped modernize it.
So you might want to check out that review:https://www.stereophile.com/content/chord-electronics-hugo-m-scaler-upsampling-digital-processor
So you might want to check out that review:https://www.stereophile.com/content/chord-electronics-hugo-m-scaler-upsampling-digital-processor