Roland MICRO CUBE GX | Micro Cube Battery Powered Guitar Amplifier Red Ultra-compact guitar amp with custom-designed speaker Eight COSM amp tones, including the ultra-heavy EXTREME amp Eight DSP effects, including HEAVY OCTAVE and dedicated DELAY/REVERB with spring emulation MEMORY function for saving favorite amp and effects settings Free CUBE JAM app for iOS plays songs and minus-one jam tracks, and lets you record the MICRO CUBE GX's COSM amp tones along with music playback