The Boss TU-12 is a chromatic tuner. You can see the Boss TU-12 in the picture which I included on the left. This is a photo of one of Brad's pedalboards when he was still with Third Day. You can have a better look at this pedalboard here. The Boss TU-12 is the pedal on the right, between the Electro-Harmonix POG and the Fulltone Wah pedal. You can have a closer look at this tuner here. On this image you can clearly see all of the tuner's knobs and controls.more
As stated on Philip Bynoe’s web page: “This is another pedalboard used on the Vai Tour. The Pedals are: Morley Distortion Wah Volume, Dunlop DC Brick Multi-Power supply, MXR Stereo Chorus, Tech 21 SansAmp Bass Driver DI, Morley ABY Selector/Combiner Switch, Boss TU-12 Tuner, Line 6 Relay G30 Wireless, and a Boss SYB-5 Bass Synthesizer.“more
When I was starting on the wee acoustic, this dinosaur kept me from sounding as terrible. While it cannot compare to the TU-2 that I now have, it was still a very useful tool. The only problem was I had no adapter, and I never had batteries, so that was annoying. But otherwise, it was a very reliable tuner.
The first tuner I ever bought. Purchased because it has a mic in addition to the line input (and I play horns in addition to electric guitar and bass). Worked extremely well, without fail, for many years. Anyway, it's ancient technology now and I couldn't even tell you where it is resting, but hopefully R.I.P.
It tunes. But everyone can hear it, unless you unplug to do so. Modern tuners mute as they tune. Punters lose their favourite song... the one that every band used to play... E EEEE A AA AA DDDDDDDD.....