Dedicated effects for acoustic guitar, saxophone, trumpet, violin, harmonica, and acoustic bass Looped for recording up to 30 seconds/ 64 beats of CD-quality audio with seamless start and end times 50 memory locations for storing user-created Patches 68 built-in rhythm patterns tailored for unplugged styles of music can be used in combination with the looped A1 four and A1X Four runs on 4 AA batteries, with alkaline battery life of 18 hours; maa-1 requires 2 AA batteries