Hey there,
For those of you who need a DC power supply for the Keylab MKII, here is what I found that is working well. Of note is that that Keylab is using a different polarity than all the guitar pedals I own.
Of note: I'm not affiliated with anything I'm posting, just have a Keylab MkII, and needed a non USB power supply:
I'm using a TrueTone 1 spot supply has a nice long cable, and supplies 9v at 1700ma (1.7 amps).
They also sell a polarity reverse cable, search for:
Truetone CYR Converter for One Spot Power Supply with Reverse Polarity
Hope this helps!