<num> (1 to 14)
The number of the track you'd like to enable bank-switching on. Entering a 1 will bankswitch track A, 2 for B, 3 for C, and so on.

If you're working on a complex piece, you might see this error from NESASM:
Bank overflow, offset > $1FFF!

NESASM has to organize data into 8 kilobyte banks. If a track takes up more than 8K, a bank will overflow. If you get this error and see a track that has a lot of data, try bankswitching it so the data can continue into a another bank.

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