El Amplificador favorito de los artistas en las TAKAMINE PRO SERIES. CT4B II Preamp Features The CT4B II preamp is designed for ease of use and purity of tone. The CT4B II consists of 3 bands of graphic EQ tone control, a volume control slider and a built-in chromatic tuner. The 3 band EQ provides control over the bass (LOW), midrange (MID) and treble (HIGH) frequency response. With the sliders set at the midpoint (0) the electric signal from the guitar is evenly balanced across the frequency range. The desired tone is then dialed in by using the sliders to add or subtract frequency response as desired. Each frequency control slider will raise or lower the band response by +/-5db. The volume slider adjusts the output volume of the preamp. The convenient built-in chromatic tuner is extremely accurate and very easy to use. The tuner is activated by pressing the TUNER POWER button. To tune your instrument, simply pluck any open string. The tuner will then display the name of the note that has the closest frequency of the string played. The amount of deviation from the note (higher or lower) is displayed by red arrows indicating sharp or flat. When only the green center light illuminates, the note indicated in red has reached precise tuning. When the guitar is unplugged, the TUNER POWER switch acts as on and off.