![]() Things aren't like they used to be and I don't really know the source but. I wouldn't even be thinking about any other possibilities if it wasn't for the fact that all balanced I/O doesn't absolutely guarantee ground loop free connections like it should if everything was designed properly. My brain is telling me that this is cause of the ground loop, but if I've got something wrong, please pipe up. I'm thinking the correct place to fix this in in between the USB midi adapter on the keyboard (if I'm correct in assuming that is what's being used) as the USB port on the computer, and the audio interconnects are all balanced as far as I can tell. Sigh.Ī USB ground isolator and/or inline audio hum eliminator will likely fix this with a lot less trouble. And now with our new fangled USB connectivity, problems that were solved decades ago are back from the grave. If it's a usb midi connection, that could explain the lack of optical isolation causing a ground loop, which shouldn't be possible with old fashioned midi cables, because engineers saw that problem coming, and devised a solution. I'm pretty sure I know the answer, but I just want to be sure I've got the right picture in my head. I suspect it's due to the two devices (instrument + interface) both being connected through USB to the same computer,ĭoes the instrument having a usb connection mean that it has a built in USB audio device, or a USB midi device? Exact same thing happens with a digital drum set.ĭoes that mean your piano has a built in USB midi interface? But if I unplug one or the other, it goes away. If I connect my Yamaha piano to the computer through USB and to my interface (which is also connected to the computer through USB) through 1/4" cables, I get the whine. I'm still slightly confused as to exactly what is connected and how. How can you record both midi and audio from the Piano if your midi leads aren't long enough to connect to the piano. You need to be more thorough and precise in how you explain your setup. I don't have a MIDI cable long enough to try connecting the piano that way to the interface, Sometimes I want to record both audio and MIDI from the piano. Isn't midi optically isolated? Never had a problem with midi ground loops, and I always assumed that was because of the optical isolation. That's not really a solution for the piano though since the interface only has one MIDI input, and the drums are using it. Both 1/4" and MIDI into the interface = no noise. I don't have a MIDI cable long enough to try connecting the piano that way to the interface, although I suspect it would work fine since that's exactly how I have the digital drum set hooked up. The digital piano is connected via balanced Mogami cables with Neutrik connectors to the balanced inputs of a Focusrite Scarlett 18i20. At the moment, I have to leave one of them unplugged or I get the noise (which is recorded, not just a monitoring noise). But at the very least, I don't want to have to unplug the audio connections and plug in the MIDI (or vice versa) every time I want to use one or the other. If you just want midi from the devices, and you're running virtual instruments that's fine, otherwise the ground loop really needs fixing. ![]() That only works if you don't want the audio output from the keyboard or drums. ![]()
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