This is a New JOYO JF-21 Splinter Classic Distortion Pedal from Joyo, listed in Distortion Pedals on Just Pedals. Read More below.
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The JOYO JF-21 is a distortion pedal. It is intended for producing more pronounced gain and distortion in an electric-guitar signal.
Key identified features include fuzz and filter effects.
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.
Distortion clips the waveform more firmly than overdrive, generating dense upper harmonics, longer sustain and a more compressed response. Circuit topology and filtering decide whether the sound is tight and focused, broad and aggressive, smooth or deliberately abrasive. Gain sets the amount of clipping, while pre- and post-distortion tone controls strongly influence low-end definition, midrange presence and high-frequency texture.
Changes tone by allowing selected frequency regions to pass while attenuating others. Cutoff sets the transition point, resonance emphasises frequencies around it, and an envelope, treadle or modulation source can move that point to create vocal or sweeping motion.
Pushes the signal into extreme clipping, often approaching a square wave and producing dense harmonics. Transistor type, bias, input loading and filtering govern whether the texture is smooth, woolly, gated, spluttering, octave-rich or highly responsive to the instrument volume.
