The JOYO R-27 is a compressor pedal. It is intended for controlling dynamics and evening out signal level.
Key identified features include bass-guitar use.
- Brand: JOYO
- Model: R-27
- Product type: Compressor Pedals
- Features: Bass

This is a New JOYO R-27 Scylla Bass Compressor Pedal from Joyo, listed in Compressor Pedals on Just Pedals. Read More below.
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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.
Compression reduces the difference between louder and quieter parts of the signal. It can restrain peaks, lift decaying notes and make picking feel more even, but strong settings also change the attack and add audible sustain or pumping. Threshold, ratio, attack, release and blend determine when gain reduction begins, how firmly it acts and how much natural transient detail remains.
Voiced or equipped to retain low-frequency fundamentals and the higher headroom of a bass signal. Clean blends, crossovers and bass-specific filter ranges can preserve weight and articulation while the effected portion adds harmonics, movement or ambience.