The A1 FOUR revolutionises acoustic instrument performance with over 80 preloaded effects, including more than 35 groundbreaking effects specifically engineered for acoustic instruments. Guitar players can access a multitude of warm and rich tones, from live “unplugged” performance sounds to the finger-playing styles of country and blues. The gorgeous effects and acoustic guitar modelling will take your instrument to places it’s never been before, opening up a world of sonic possibilities.
Saxophone players will find the A1 FOUR makes it effortless to perform that gritty, rock-and-roll sax growl, or use the lush custom-chorus effect to emulate jazz fusion sounds. The all-new “SaxChorus” effect creates a more natural double-track and thick tone response by softening the modulated sensation typical of chorus effects designed for electric guitar. Ready-made settings for EQ and compressors ensure your sax preserves its acoustically warm sound, even when amplified through microphones.
Trumpet players can shift from the bright sound of electric jazz to Zoom’s signature Auto Wah sound effect, with the “Tp MD70” preset patch tuning the Pedal Wah sound to resonate and adapt to the trumpet’s low frequency range and curve. Violin players can create the rich, full sound of a string symphony or dive into raw, distorted metal sounds. Harmonica players can achieve punchy, mid-range blues harp sounds or experiment with new sonic territories, while the “Hm StevieW” preset patch provides that famous harmonica sound with chorus wet signal effects modified for chromatic harmonica frequency response.
The A1 FOUR even caters for upright bass players with focused highs and rich lows, providing control and flexibility from classical to rockabilly and all styles in between. Add octaves, select your piezo effect or create your own unique signature sound. This makes the A1 FOUR the ideal effects unit for acoustic instruments across all genres and playing styles.
- Over 80 built-in effects
- Dedicated effects for acoustic guitar, saxophone, trumpet, violin, and harmonica
- Up to 5 effects can be used simultaneously, chained together in any order
- 50 memory locations for storing user-created patches
- Effective anti-feedback filter
- Looper for recording up to 30 seconds / 64 beats of CD-quality audio with seamless start and end times
- ZOOM Guitar Lab software for creating, editing and managing effects and patches
- 68 built-in rhythm patterns tailored for unplugged styles of music
- Onboard chromatic tuner supports all standard guitar tunings, including open and drop tunings
- Output jack for connection to amp or headphones
- Runs on 4 AA batteries, with alkaline battery life of 18 hours
- USB port for firmware updates, power and connection to ZOOM Guitar Lab



