good for synth
love this pedal, very well built and lots of control over frequencies. i use it with my modular synth because i don't have room for a fixed filter bank in my case, and this does what i need it to do. only minor complaint is one that most guitarists will ignore--the faders have a center notch, and are relatively stiff. i wish i had the same pedal in a larger case with huge, smooth knobs or faders for big big frequency control. the gain control introduces some hiss/hum when imbalanced, but i like to drive it hard and use the noise as part of my signal path.