There’s also a 1/4″ DI Instrument input on the front for things like guitar or bass.
However, if you have high-output Active pickups, you could also use one of the inputs on the rear.
When you use the DI on the front, it will bypass Input 1 on the rear, so you can only use 4 total inputs at one time.
The front also has 2 independent headphone outputs.
When you plug in headphones, it will automatically bypass the speakers plugged into the rear.
Headphone 1, would bypass Output 1/2
Headphone 2, would bypass Output 3/4
This makes it quick to switch between your studio monitors and headphones.
To use headphones and studio monitors at the same time, you could plug your monitors into Outputs 1/2 and plug the headphones into Headphone output 2.