We use these as a midi controller to play virtual software instruments. We do not use any built-in sounds from the keyboard.
Controller: Korg nanoKONTROL2
The buttons and faders on this controller are used to adjust real-time parameters such as reverb, delay, volume, and patch changes
Computer: Macbook Pro
We use the Macbook Pro to run all of our software and plugins. Here is an article on what software we use.
Interface: Apogee Duet 2
This USB interface connects the computer to your speakers/sound system.