* A1 FOUR offers over 80 built-in effects / A1X FOUR offers over 90 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 * 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 can be used in combination with the Looper * Onboard chromatic tuner supports all standard guitar tunings, including open and drop tunings * Output jack for connection to amp or headphones * A1 FOUR and A1X FOUR runs on 4 AA batteries, with alkaline battery life of 18 hours; MAA-1 Requires 2 AA batteries * USB port for firmware updates, power and connection to ZOOM Guitar Lab