+1 here
Keylab MKII 61
Firmware 1.3.1
on Windows 10
Using it for over a Year now. I always used the regular MIDI OUT on it, so recognized the problem pretty late, when I played arround with some MIDI scripts.
Was switching from 5pin MIDI-Out to USB-MIDI, because the keyboard stopped sending MIDI after sometime (after maybe 5- 20min) and only worked again, when reconnecting. It doesnt turn off, you just hear the Windows-sound for disconnected USB-devices (mostly 2 times: first for the control section and second for the keys).
So I just tried only USB, bc who knows?
(I think it has something to do with the Vegas-/Sleepmode, because it appears that it happend quicker when I don't actively use the keyboard for a while, maybe also in combination with a buggy FL Studio Script [the official one], but it won't change when I turn it off... will test it some more).
This problem aside, regular MIDI is working just fine.
On the other hand USB-MIDI is on my keyboard kind of a mess. I got stuck notes (no note off signal is sent) and more frequently: missing notes, when playing more than one note.
I tried powering the Keyboard via USB with the Ground Loop Adapter and different USB-Chargers (old one with 5V-1A & newer one 5V-3A/9V-2A/12V-1.5A).
USB-powersaving plan on Windows is disabled. Powersaving in general is disabled.
Tried different USB-cables, different lengths, different brands and different combinations. Connected it with the PC via USB 3.0 and/or 3.1.
Same problems everytime.
So I tried an optional power supply (an universal power supply with the right polarity. I tested it on 9V and 12V with 3A.
still the same problems. Maybe there were a fewer stuck notes, but it is hard to replicate it evenly. Oh yeah, and I checked the power supply with a multimeter, just to be sure.
I did a reset to factory settings before i try all this.
I didn't test the keyboard on another system (mine is kind of old: AMD 1800x on a Asrock motherboard), but will do it til end of the week.
I attached an example of a MIDI recording (in FL Studio) where I recorded USB-MIDI and regular MIDI at the same time. I moved one two octaves lower to show the missing and stuck notes over a period of 50secs.
First I thought it's a power problem, because the more keys I press the higher is the chance of 1 (or sometimes 2) stuck notes, but with all the combinations for power supply i think it's still a software issue or a general flaw in the usb connection?
I don't know. Some people find a solution, some people don't. I wish there was an explanation for this...
It's a huge bummer, when you pay 500 bucks for this trouble.
