The SoundFont format was developed by E-mu systems in collaboration with Creative Technologies. It is a standardized data format containing wavetable synthesized audio and information on how it should be played back in wavetable synthesizers - typically on audio cards. The SoundFont format is an open standard so there is a vast amount of SoundFont banks and SoundFont compatible banks developed by third parties.
The samples in a SoundFont are stored hierarchically in different categories: User Samples, Instruments, Presets etc. The NN-19 allows you to browse for and load single SoundFont samples, but not entire soundfonts.
1. Use the sample browser to select a SoundFont file (.sf2) and open it.
The browser opens the SoundFont and displays the folders within it.
2. Select the folder "Samples" and open it.
This folder contains a number of samples which can be loaded like any other sample.
3. Select the desired sample and open it.
The sample is loaded and assigned a key zone range that spans the entire keyboard. You can now make settings for it as with any other sample.