However , it includes tone controls that can be adjusted so that the amplifier is within 0.5 dB of a neutral , uncolored frequency response .
Gallien - Krueger makes an instrument amplifier that produces a classic smiley face curve in its default voicing .
Gallien - Krueger includes tone controls that can be adjusted so that the amplifier is within 0.5 dB of a neutral , uncolored frequency response .
Gallien - Krueger makes an instrument amplifier that produces a classic smiley face curve in its default voicing .