Hello, @Teuvosick.
Non necessary. Users can use different input.wav at some cases. An example from here:
It also facilitate when someone decide to retrain a new model, getting the input and output at the same place. For instance, if someone of NAM community would like to make a model from a AIDA dsp, they maybe wrongly think that is necessary to use a NAM input.wav (I’m supposing that they use a different input).
Ok, I don’t have an answer for this. It will requires most effort of community on share the files using external sites 