The Korg NTS-1 is a really nifty kit, as an instrument I use it most as an arpeggiator because I don't have many that utilize it! However, overall it is used the most as an FX unit, which I pair up most often with the Volca Drum, although I will use its FX for a lead synth for certain genres. What makes this a really great unit is on its own how many effects it has just out of the box, which can be further expanded from FX and Oscillator patches online. One thing to note about the NTS-1, mine at least, is that it has a fairly low output volume compared to my other synths. This doesn't affect anything it's FXing, but it does make its arpeggiation and regular playing much quieter than it should be. This may not be an issue with the new Korg NTS-1 MKII, however I can't confirm this for myself.