Check the listing for details. Positive Grid BIAS Modulation Pro Effects Pedal - 9 Effects Types. Condition: Used. Listed at 279.00 USD. Positive Grid BIAS Modulation Pro Effects Pedal with 9 Effects Types. Used but in great condition Positive Grid Bias Modulation pedal for sale. In one pedal you have 9 modulation effects types with infinite customization options and connects to app via Bluetooth to make all tweaks you can think of. Tremolo, vibrato, and rotary effects to sweeping phasers, flangers, and more, the Positive Grid BIAS Modulation Pro pedal is your one-stop solution for modulation effects. It has common controls for Depth, Rate, Intensity, and Tone, plus two effect-specific Tweak controls. Three preset banks allow you to store up to 30 of your own custom patches. This pedal is also for sale locally and or on other platforms. So it very well could sell right before it is purchased on ebay. So please "buy it now" before somebody else does! Thanks so much for your interest!