A DI Box and a distortion pedal plus amp simulator rolled into one gadget.
This gadget basically is an effects pedal but has got loads of functions. First one is a DI Box. When you are in a rehearsal or gig and you forgot your amp or your guitar amp is not working for some reason like you forgot the lead, fuse or valve problems or it blew up the speaker. Then, this gadget is your saviour because you can plug this directly to your PA and on off/bypass setting, it serves as a DI box. Use an XLR lead for better quality on your PA. But obviously your guitar lead will also work because this GDI21 got two outputs; one XLR and one 1/4-inch.
Second function of this gadget is an amp simulator. You can choose between Fender, Marshall or Mesa Boogie and match it between Clean, Hi Gain or Hot channel. Added to it is a mic simulation, you can choose between Off axis, Centre or Classic. It means where the mic is positioned during mic'd in. It also got a Ground lift on and off to cancel humming or compatibility issues with amp, other effects pedal or the PA itself for that matter.
Third function is as a stompbox or a distortion pedal. Technically it works like an amp simulator but because you can dial the Drive/Gain knob on a desired level plus the tone/EQ which are bass and treble and the level/volume that you would want.... this is a perfect fuzz/distortion pedal. Tone and Drive are really nice. If you pair this with a reverb pedal or a delay pedal, plus wah pedal, then it makes a perfect gigging gear.
Here are the sample settings of this pedal:
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