Hello Narsil, my data looks something similar to this: Note On_XX, Tempo Value_XX, Chord_Note:type, Position_X/X, where XX can be a number from 0 to 127 and X can be a number from 1 to 16. I also have a dictionary with every possible values for the above text types numericalized. Will I have to write a custom tokenizer in order to accomplish this tokenization? Is there a way to use my existing numericalized dictionary in a tokenizer? Thank you for your help and the documentation I’ve begun going over it.