The MXR CSP101SL Custom Shop Script Phase 90 pedal is a reimagining of a classic, offering a vintage tone with modern enhancements. This review delves into the features, performance, and overall value of this highly sought-after effects pedal. We'll examine its build quality, ease of use, sonic capabilities, and versatility across various musical genres. Is it worth the premium price tag? This comprehensive review will help you decide.This pedal seamlessly blends the rich, swirling sounds of the original Phase 90 with the convenience of modern design. Expect a detailed exploration of its aesthetic appeal, intuitive controls, and impressive range of phasing effects – from subtle textures to dramatic, swirling soundscapes. We'll assess its power options, compact design, and overall user experience to determine if this is the ultimate phase shifter for discerning guitarists.
Pros And Cons
- Classic phase 90 sound
- Simple operation (on/off switch and one speed knob)
- On/off status indicator
- Option for 9V adapter or battery
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Unboxing and Initial Impressions
The MXR CSP101SL Custom Shop Script Phase 90 immediately commands attention with its vintage aesthetic. The script logo is not merely cosmetic; it's a nod to the revered tone of classic phase shifters. The build quality feels robust and premium, promising years of reliable performance.

The inclusion of an on/off indicator LED is a welcome addition, providing visual confirmation of the pedal's status, unlike its vintage predecessors. This seemingly small detail adds to the overall usability and convenience.
Sound and Functionality
The core functionality is refreshingly simple: an on/off switch and a single speed knob. This minimalist approach allows for intuitive control and immediate sonic exploration. The range of phasing effects is impressive, offering a smooth, wide sweep at slower settings and a more pronounced, swirling effect at higher speeds.

The pedal excels at creating a wide variety of phasing effects, from subtle textures to prominent, swirling soundscapes. Its versatility makes it suitable for numerous musical styles, from classic rock to contemporary genres.
Specifications and Practicality
Power options are versatile, catering to both 9V adapters and battery operation. The input and output jacks are strategically placed for convenient integration into any pedalboard setup. The pedal's compact design minimizes its footprint while maintaining a robust build quality.

Its straightforward operation makes it incredibly user-friendly, allowing musicians of all skill levels to quickly achieve desirable effects. The compact size and easy-to-use design makes it perfect for both studio and live performances.

Final Verdict: Is it Worth It?
The MXR CSP101SL Custom Shop Script Phase 90 delivers a truly authentic vintage phase 90 experience with modern conveniences. The sound is rich, nuanced, and incredibly versatile. While it's a premium-priced pedal, its build quality, sound quality, and ease of use justify the cost for discerning players.
For those seeking a classic phase 90 tone with a few modern upgrades, this pedal is a must-have. The simplicity of its controls, coupled with its rich sonic potential, makes it a highly desirable addition to any guitarist's arsenal. The combination of vintage tone and modern convenience makes it a strong contender.