Maxon AF-9 Auto Filter
Fil(ter) yer boots
Although it has a number of slightly intimidating-looking controls, the Maxon AF-9 comes to life as soon as it’s plugged in. The sliders for sensitivity and peak are wonderfully intuitive and the frequency range is controlled not by a pot, but by a two-way switch. While at first this may seem a limitation, it frees up brain power to focus on the other controls. The two range options are high, 200Hz-4kHz and low, 100Hz-2kHz allowing for both guitar and bass (or droptunings) to be used. There’s also a selector for high-pass, low-pass or tasty wah-style bandpass filtering.