If there’s any company you’d expect to understand the delicate relationship between pickups and pedals, it’s Seymour Duncan. The company’s Pickup Booster Mini, an evolution of the Pickup Booster that’s been around for roughly two decades, certainly reflects a less-is-more philosophy about what you should stick between a good pickup and your amplifier. But while the Pickup Booster is simple, it’s far from inflexible, nor, in most cases, does it sound very “mini.”Friend to the Single CoilThe Pickup Booster Mini’s versatility is most evident in its resonance control. These shifts are clear when you use the pedal with single coil pickups at the front of a pedal chain—in fact, the resonance switch works only when the Pickup Booster Mini is the first stomp in a line. The differences between settings are also apparent when used with a clean amp. So yes, Fender-oriented players, with their single coils and high-headroom amps, get a fatter share of the fun when using the Pickup Booster Mini, as well as a greater sense of the pedal’s transformative power.For all its single-coil bias, the Pickup Booster Mini is still a good buddy to humbuckers.I tested the Pickup Booster Mini’s interaction with different pickups using two contrasting rigs—first between a Fender Jaguar and black-panel Deluxe Reverb, then an SG and the Marshall 18-watt setting on a Carr Bel-Ray. To widen the stylistic disparity between these surfy- and AC/DC-sounding setups, I deliberately set up the Jaguar/Deluxe tandem for fairly anemic output, with the amp volume just past 2. Without the Pickup Booster Mini the combination was thin and lifeless. With an assist from the pedal, the previously absent low- and low-midrange became quite prominent—and not in a fashion that just added mud to the equation. Instead, it lent sustain and a warm, discernible glow to overtones while maintaining the Jaguar/Deluxe combination’s sunny essence. Could I have generated the same tone by turning the amp volume up, the guitar down, and adding some bass? Not easily with the Jaguar’s 1k pots. But even a Telecaster with a finely tapered volume control couldn’t always match the low-mid punch the Pickup Booster Mini added at lower amp volumes.For all its single-coil bias, the Pickup Booster Mini is still a good buddy to humbuckers. In the more AC/DC-like SG/Carr set up, the Pickup Booster Mini worked best as a lead boost. And in terms of creating bolder tone contrasts, I had good luck with the pedal’s resonant peak 2 setting which, while ostensibly ideal for making single coils sound like high-gain humbuckers, can lend an almost cocked-wah like focus to leads.You don’t have to use the Pickup Booster Mini at the front end of a pedal chain. Its buffer also means you can use it at the end of long cable runs to make up for the associated tone loss. You lose the flexibility of the resonance switch, but it still sounds fantastic and can work as an almost compression-like glue to meld overtones and artifacts from delay, reverb, and modulation units.The VerdictIf, like me, you’re always looking for ways to shrink your pedalboard, the Pickup Booster Mini makes an appealing ingredient in a compact setup. Though it doesn’t excite the treble spectrum quite as much as some boosts and overdrives, it restores the fullness often lost when using single-coil pickups at low amp volumes, making it a simple, cost-effective cure for one of many performer’s most common challenges.