The XIOSYNTH 49 is an excellent portable solution for complete MIDI controller, audio interface and synth. I bought it for jamming and recording in remote locations and found it stood up well to harsh conditions and demanding work. Latency is ultra low and the audio very stable [working with Ableton]. The synth is a bonus and if you're familiar with Novation's K-Station or V-Station you'll recognise that awesome 'liquid analogue' warmth they capture... battery or USB bus power adds another dimension to flexibility of use. Cool kit for sure!