New features Pre-emphasis filter and loss (#42) WaveNet and CatWaveNet models (#43) Bug fixes and performance improvements Fix bug exporting parametric models (#41) Remove redundant "nx" in data set config; let the model provide it w/ its receptive field. Faster data indexing in ConcatDatasets with many data sets (#45) Miscellaneous improvements to the LSTM model. Improvements to the Colab notebook.