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(1 customer review)

Practicing by your lonesome can be a chore, especially when you keep getting told to keep the noise down. Joyo’s Gem Box helps solve that problem by letting you plug your headphones into it so you can rock out all you want without worrying about the neighbors. That’s not all this multi-effects unit can do, though; the Gem Box omes packed with 60 effects types spread across eight effects modules, 40 preset patches, 40 user-defined patches, 40 drum rhythms, an assignable expression pedal, and a tuner. All this in a compact, budget-friendly floor unit.

Brand: JOYO


  • ◆ JOYO GEM BOX Multi Effects Processor has 60 Effects (8 effects can be used simultaneously).
  • ◆ 25 Drive Sounds, including 15 famous stomps and 4 legendary amp models.
  • ◆ 40 Factory/40 User Patches, 40 Drum Machine Patterns.
  • ◆ On board Tuner and Preset Recall Function.
  • ◆ Assignable Expression Multi Effects Pedal with compact operation interface.



GEM BOX I is the model of JOYO’s first generation multi-effects pedal,it featured light-weight and tiny for easy transportation, compact operation interface

No. of Effect Modules: Max. 8 simultaneous modules
No. of Effect Types:  60
Preset Patch Memory: 40 Patches (4 Banks, each bank has 10 patches)
User Patch Memory:  40 Patches (4 Banks, each bank has 10 patches)
Sampling Frequency:  48 kHz
A/D converter:  16 bit, 384 times over sampling
D/A converter:  16 bit, 384 times over sampling
Guitar Input:  1/4″ monaural jack, input impedance 470 k Ohms
Output:  1/4″ stereo jack (doubles as line/headphone jack)
Power requirements:  AC adapter 9V DC, 300 mA (center minus plug)
Or 4 IEC R6 (size AA) batteries(not included)

Delivery information:
* Product size: Approx.23.8*15*5.8cm
* Product weight: 0.72kg
* Package size: 34*16.5*6.8cm
* Package weight: 1.0kg 

Package List:  
1 * Guitar Modeling Processor(With One Joyo Gem Box) 
1 * Adapter 9V 
1 * User Manual

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Based on 1 review

4.0 overall

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  1. Anonymous guitarist

    I don’t know about your item, but i bought this joyo gem box from a shop, i plugged it in just to noticed that this effects pedal has very short sustain.. is there any advance settings to add more sustain to my guitar sounds, please let me know.. i really love to use this pwdal because it has no complex dailing on the parameters. Simple switching of the selector i can do adjustment to any module. Simple display panel that will not be complicated for a beginners. I will try to keep updated on this pedal.. thank you

    Anonymous guitarist