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Light-up USB-MIDI controllers causing pitchy noise when lit
I have several USB-MIDI controllers that light up... Korg nanoKey Studio and a QuNeo. Both are plugged into a powered Belkin USB hub, which goes to an iConnectivity iConnectAudio4+.
The Korg nanoKey Studio pretty constantly has a dancing light show going on, and you can hear the hum fade in and out depending on when lots of lights are on. The QuNeo is way worse, it almost sounds like a telephone tone whenever I play pads and they light up.
How can I eliminate this??
Comments
Two places the hum could be introduced, most likely, are via the shared power outlet the iCA4 and the Belkin walwart are sharing or the USB cables inter connecting the controllers, hub and iCA4.
It might be the hub is under powered, since the increased load generates the noise. Maybe look for one with higher amperage.
Could also be cheap USB cables. Try swapping those out with heavier gauge cables.
Or both!
Hi !
1.Check your usb wires, if you have some others that look more robust, try them.
2.Try to plug your devices far from each other. (isolation...)
3.Try to unpowered your hub. The ICA 4+ may light it up herself...
4.Do you have an other hub ? Or an other transformer for your actual hub to test ?
Let us know, and good luck !
And use your ports in the hub sepparated almost by one between them, it seems usual make this add noise to the cables (idk why but I tried and confirmed in my trust hub)
as a first step turn one of the PSUs, so it's plugged in with switched pins
if nothing changes, leave it as is and flip the other one
still bad ? flip the first one to it's original position
these are all combinations, the procedure frequently solves simple ground issues
if it didn't help thigs are more complicated, but it's ground in 95% of all cases