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