You can add new instruments to percussion kits within the Edit Percussion Kit dialog.
Procedure
- In Setup mode, in the Players panel, expand the card of the player holding the kit to which you want to add instruments.
- In the kit instrument label, click the instrument menu and choose Edit Percussion Kit to open the Edit Percussion Kit dialog.
- Click Add New Instrument to open the instrument picker.
- Select the percussion instrument you want in the instrument picker.
- Press Return to add the selected instrument.
- Click Close.
Result
The selected instrument is added to the percussion kit.