The endorphin.es Grand Terminal is a modular synthesizer that combines the classic sound of vintage modular synthesizers with modern digital technology. It is a powerful and versatile instrument that can be used to create a wide range of sounds and textures. It features a range of inputs, outputs, and controls that allow users to create unique and complex patches. It is designed to be used with both analog and digital synthesizers, and its onboard sequencer allows users to sequence and automate their patches.