Buy Joyo JDI-01 DI box with Amp Simulation for Acoustic/Electric Guitar or Line The JDI-01 is a modern and efficient DI box from Joyo Audio. Download. The JDI-01 from JOYO is a very useful DI with in built guitar amp emulation technology. Perfect for performing guitarists that want a consistent sound out front. JOYO JDI-01 is a modern and efficient DI box from JOYO Audio. It features the best of guitar cabinet simulation, a ground lift switch and a balanced XLR output. JDI-01 is a passive direct box with amp simulation. 4x12 Combo amp simulation selection. 15k Ohm IN, 600 Ohm balanced XLR OUT. Can be directly connected.