What’s the most important pedal on your board, that’s also the least exciting and is more often than not the most irksome one to buy? You’re dead right: it’s the humble tuner. Yet if you play live and hold even a shred of respect for your audience, an onstage tuner is a must-have piece of hardware. Effects giant BOSS currently has a vice-like grip on the stage tuner market, so what can Danish effects company TC Electronic bring to the table? Well here’s the revelation: the all-new PolyTune has the ability to show you, with one full strum and in one single display, whether all six strings on your guitar are either sharp, flat or in tune. Now that, tuning fans, is big news.