Very weak, but enough to annoy your audio shields. so you can get a situation where your instrument or equipment chassis is a conductor of flowing AC current trying to get to earth. Electrons trying to escape to earth take the path of least resistance. In a perfect world there would be zero ohms between their chassis and ground - but in an imperfect world there is some resistance, and the resistance may not be equal at different points. If it is ground loop hum, the basic problem is this: the piano and sampler both have ground connections. I would record that with a passive transformer DI such as a Radial JDI, into a preamp - I find that transformers isolate these hum problems very well. Try to power them from the same AC source. Is everything power from the same AC receptacle? If your piano and sampler are in different rooms, for example, that is very likely to cause this. Probably ground loop hum - common problem with unbalanced instrument cables.
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