Multi-effects processor for Acoustic Guitar, Saxophone, Trumpet, Violin, Harmonica, Acoustic Bass and more from Zoom. With specially engineered effects, built-in looper and drum machine, the A1 FOUR is the first multi-effects processor designed for a variety of acoustic string and wind instruments. The A1 FOUR is preloaded with over 80 effects, including more than 35 new groundbreaking effects designed and engineered for acoustic instruments. Add a multitude of warm and rich tones to your guitar. From live “unplugged” performance sounds to the finger-playing style of country and blues, there’s so much to choose from. Popular effects such as Distortion, Chorus and Wah are typically designed to work with the electric guitar. The A1 FOUR provide all-new effects that are engineered to process the unique signals generated by acoustic instruments. For example, with the sax and trumpet, original acoustic sounds are controlled by the musician blowing the horn with more or less intensity. As an example, the Wah effects are uniquely re-voiced in the A1 FOUR by adding a Low Pass Filter (LPF) to best control the processed frequency response of the instrument. This allows musicians to hit the peak frequency points while still blowing naturally into the instrument, without losing any expected sonic response of attack and release. Another example is the violin. The bowing attack is key to the expression of the violinist. To recreate the electrified sensation of distortion without losing the bowing attack, the DIST effect for Violin shifts the clipping 1 octave higher, boosts the high frequency and reduces the lows. This creates a more balanced saturation that suits the sonic characteristics of the violin. With a free download, ZOOM Guitar Lab software explore an endless world of patches and effects. And with its added ability to edit effects and arrange patches designed for Acoustic Instruments, you can experiment and create endless combinations.