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The Curveball is a 3 band EQ with dual Boost functions and can even be used as a clean channel preamp.
Product ideas we’ve received for EQ have ranged from graphic EQ’s, to fully adjustable parametric EQ’s and all points in between. The Curveball sets up various EQ curves using a simple to understand 3 band active EQ, so it’s flat when set straight up. The all important Mid frequency is selectable using the Mid switch, to easily simulate 3 band passive EQs from classic US amplifiers, UK amplifiers, and the Thrash EQ setting puts the middle right in the sweet spot for metal. The Mid knob also boosts in a peaky way through that same frequency range, making this a great way to dial in great parked wah tones by boosting it. It’s also easy to boost some mids when changing to a second guitar that is hollow and hard to match up to your rig.
The Curveball can be used in front of distortion to add more gain while tailoring the attack and thickness of the distortion, and Amptweaker’s Tight switch helps dial that in with the Fat-Normal-Tight settings. The Low knob boosts in a shelving way, but cuts more like a Tight control so you can further optimize the attack. The High EQ also boosts in a shelving way, but rolls off highs more like a guitar tone control. This provides the most flexibility in tweaking your front end boost.