I am very impressed with this little pedal for many reasons. First, Its nice and small, which is a big plus for me as I keep my pedalboards small. Second, there are a lot of sounds packed into it. For modulation effects, I almost always have a chorus on my pedalboard. This pedal has two great chorus sound, plus five other different modulation effects; Flanger, Rotary, Tremolo, Phaser, and Vibrato. It is nice to have the options to have many pedals at your finger tips without having to lug around 7 pedals. Plus with mod effects, I rarely would even want to do more than one at a time.
https://www.amazon.com/Donner-Guitar-Modulation-Effect-Digital/dp/B0716RYXC2/ref=sr_1_1?ie=UTF8&qid=1499728405&sr=8-1&keywords=donner+mod+square