Carl Martin 3 Band Parametric PreampCarl Martin 3 Band Parametric Pre Amp has been specially developed for musicians who play ACOUSTIC GUITAR, VIOLIN, ACCORDION, DOUBLE BASS, etc. These musicians often use combo amps and do not find the use of 19" rack equipment very practical. Experience has shown us that these instruments often require a high quality EQ and balanced line driver. We have integrated those features into a handy stomp box format. For maximum flexibility, we found it