Well seriously, take a look at the Arturia Beatstep and Beatstep Pro.
First I bought a Beatstep, liked it so much, I bought a Beatstep Pro a few months later. I also picked up an Arturia Keystep and nowadays they have a Keystep Pro but I see no further need to upgrade.
They all run on USB power, but need no software, and have MIDI OUT and CV Ports.
The Beatstep can only handle a single MIDI channel at a time. The Pro can handle 2 and a Drum Channel.
Believe me, there's no easier way to sync up 3 or more devices in a hurry if you are using it in the studio.
Arturia BeatStep Pro USB MIDI Sequencer & Controller : Amazon.ca: Musical Instruments, Stage & Studio
www.amazon.ca
The price has gone up $150 CDN since I bought mine 3 years ago, BUT, this week Is Black Friday week so a bit of hunting could score a deal.
Believe me, these little Arturia Sequencers are extremely popular for a reason. The Keystep uses a Fatar keybed with aftertouch and two ribbon controllers. The controls are firm and solid and the overall build quality of all the units is solid metal all around. They have considerable weight.
I have very little experience with Korg sequencers outside of my Minilogue but I can say the Arturia ones are better in every single way.
Gary