Brand

Joyo

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.

Category

Tremolo & Vibrato Pedals

Tremolo varies amplitude, making volume rise and fall; vibrato varies pitch, making the note move sharp and flat. Some circuits combine both or derive them from modulation systems that blur the boundary. Rate, depth, waveform and stereo phase determine whether the motion is smooth, pulsing, choppy, seasick or spatial, while tap tempo can lock the cycle to a rhythm.