Behringer Ultratone K900FX Keyboard Amplifier Dunlop just set the Filter Modulation

just set the Filter Modulation switch to the On position and use the Controllers Mod Mix knob to make it so

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Behringer Ultratone K900FX Keyboard Amplifier Dunlop just set the Filter ModulationULTRATONE K900FX The 90 Watt ULTRATONE K900FX excels as an extraordinarily versatile keyboard and drum amplifier, as well as a high quality 3 channel Public Address (PA) system, with a world class, 12" Bugera Speaker all in one compact and easy to transport package. Specializing in rich, accurate tone and professional features, such as a studio grade Multi FX Processor and our own FBQ Feedback Detection System, this powerful workhorse will bring out