This is a New JOYO GEM BOX Multi-Effects Processor from Joyo, listed in Multi-Effects Pedals on Just Pedals. Read More below.
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The JOYO GEM BOX is a multi-effects pedal. It combines several effects or processing functions in a single unit.
Key identified features include amplifier simulation.
JOYO Technology is a Shenzhen music-gear company whose range goes well beyond stompboxes. Its official catalogue covers guitar and bass amplifiers, acoustic and busking amps, effects, power supplies, interfaces, wireless systems and accessories. JOYO also says it develops acoustic-core technology and has applied for utility patents. JustPedals listings include the JF-21 Splinter distortion and JF-319 Green Legend overdrive, alongside mini amps and power adapters. That breadth matters when comparing products under the JOYO name: some are effects, while others support the rest of a guitar or bass rig.
A multi-effects processor combines several effect algorithms and signal-routing stages in one unit. Its sound depends not only on the individual models but on their order, parallel or serial routing, processing resolution and available control. Preset structure, switching gaps, foot control, expression assignment, amp or cabinet modelling, USB audio and MIDI determine how completely the processor can replace separate pedals.
Recreates the gain structure, tone controls, compression and frequency response of a guitar or bass amplifier. The simulation may model only a preamp or extend through power-amp behaviour, allowing the result to range from clean amplification to dynamically responsive breakup.
