Upsampling MQA files to original resolution with sox

[Cebolla]

Isn't this upsampling with minimum phase steep filter just a substitute for the final MQA rendering step, which produces the 'further unfolds'?

So, there appears to be nothing here that takes care of the initial step, ie, the actual MQA decoding of the MQA source file track to produce the MQA Core signal (aka 'first unfold').


If that has already been taken into account, how do you get the MQA Core signal/first unfold into MinimServer in the first place?