Practice Settings - Instrument and Tuning includes Custom 1 or Custom 2 instruments.
Select Custom 1 or 2, click OK, and the Custom String Instrument Tuning dialog box will open.
Here you can design and create a new instrument or special tuning. First set the “Number of Strings” to a number between 1 and 11. Then tune each string by clicking on its string name on the left and scrolling to and selecting the desired pitch on the right.
To display a 5 string banjo use “Reset to 5 String Banjo” before tuning the strings. This will create the shorter 5th string on the display.
see also: Instrument and Tuning