Soundbrenner wants its Core smartwatch to be the ultimate tool for musicians

Soundbrenner made waves a couple years ago with the Pulse, a wearable metronome that used vibrations to help musicians jam. Now, a few years and 60,000 units later, it's back with a more advanced version. The Soundbrenner Core, available on Kickstarter now for $159, pairs the original's metronome feature with a magnetic tuner, a decibel…