MXR CSP101SL Script Phase 90 with LED
MXR CSP101SL Script Phase 90 with LED

CSP101SL Script Phase 90 with LED, Phaser for Guitar from MXR in the Phase 90 series.

King Loudness 01/31/2012

MXR CSP101SL Script Phase 90 with LED : King Loudness's user review

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The MXR CSP101SL is a newer reissue of the Phase 90 original script logo version made in the seventies and used by players like Edward Van Halen. The subsequent block logo models made in the later seventies and through to the present day are more "chewy" and present sounding than the script models and thus not as desirable as the older ones. However, they can go for a pretty penny for an original script logo, so eventually MXR came out with this reissue. It's pretty simple... has one control for "speed" (modulation amount) and some newer features such as the LED and AC adapter jack that the originals lacked. However what it lacks in features it makes up for in tones.


Setting up this pedal is pretty simple for sure. It only has the only control knob, so you aren't left scrolling through endless presets or turning knobs. It goes from a very subtle sweep kinda like a modulating treble boost to full out phaser fury, depending on what sort of sound you want. I like to run mine at about 9 oclock for that nice Van Halen esque treble boost for my leads or as a nice sound changer for my clean channel.


I use this pedal in my main gig rig with my band as something that really alters up my tones for a bit of added flair. It has a sound that is much closer to the original Script Logo models. The one major flaw is that it isn't true bypass, so it does make a fair bit more noise than I'd care for. That being said, it sounds like a good phaser should and is definitely more subtle than the block logo models I've tried. If these were true bypass, they'd be unbeatable for that classic phase tone.


All in all I think the MXR Custom Shop Phase 90 is a great pedal for someone looking for that classic phaser tone in a pedal. It's not as versatile as some other units, but I like it much more than the block logo models and if it was true bypass/less noisy, it'd be near perfect. At about $110 new this pedal is a decent deal for someone looking for the real MXR sound and is definitely worth checking out.