It is simply recording samples in another language as to allow users to use those samples to quickly make the UTAU sing in that language, as opposed to slaving over a "to" and an "u" to make "two" because the only other option is to use "tsu." Or, with Japanese UTAUloids, use 'tu' as a substitute for 'two'.

The various methods for English banks are detailed in Creating An English Bank

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