Rob Does it disappear if you stop using USB MIDI out?
Yes, it stops exactly when I unplug the cable. I can hear it both in a test recording and I can see it in the volume meter inside OBS: There is constant flickering up to -55 dB; disappears when I unplug USB.
Rob This can often be a cause of hum, compared to 5 pin din MIDIcables, which are optically isolated.
I wasn't aware of that fact. I thought nowadays with USB connectors, the 5 pin din MIDI connectors are obsolete. Thought this is "old world stuff", before USB was invented. As my PC does not have midi connectors, I canceled that option completely. I thought, USB is there on both devices - no need to buy a MIDI converter - just use a printer cable.
But I want to keep MIDI for recording, I use it only for my virtual keyboard to display the fancy blue key in my videos. So my options are now:
I think, I'll go for the audio interface, because some internet research confirmed your statement about the optically isolation. Furthermore, this should be even better than a hum destroyer, becaues the hum destroyer has the potential to reduce the analogue audio signal coming from the headphone jack.
To be fair, for my level of playing this won't make any difference, but an audio interface has additional advantages like the option to hear a backingtrack from the PC and monitoring my own playing via headphones.
Additionally, it allows to use my trusted and moth-eaten Genelec 4010 speakers for both, the PC and the piano.
Well - this removes the Fender Quantum LT4 from the candidates list, because it does not have MIDI-connectors. Too bad, I loved the placement of the in- and output jacks and I loved the good latency values. Not as good as Fender claims, but still better than the entire competition is this price range.
@Rob: Thank you very much for your post, you saved me from a big hassle. Using an audio interface without MIDI, but having the piano USB-connected to the PC is very likely to have the same hum. (According internet)
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