Tmdj.alby

Some news... I also tried the same setup with another keyboard, a microkorg (synth) connected with midi-out and line-out to the soundcard. Even in this case, no noise! It seems that the Casio is the only one afflicted by this problem...

I plugged the power directly to wall and the PC is on battery. No cable intersection and I'm using high quality jack cable (band anyway they're the same that I use with the Roland). Maybe the fact that the Casio line-out are unbalanced could be the cause?

The noise is certainly a USB ground loop. I don't understand why this noise is so loud with this keyboard and not with the other one... maybe the line-out quality? For the other questions... the USB (Casio) is NOT plugged and I use the line-out (but I also tried with all other in/out with the same result) the soundcard is a Presonus Audiobox USB...

I'll try to explain better the situation. The MIDI part is as you just told above. With this I have no noise in the monitor (or headphone). BUT if I plug (to the sound card line in) a cable from line-out of Casio I can hear a huge amount of noise in the monitor even with low volume and relatively low input gain!

For sure! The strange thing is that if I use another keyboard (my old Roland) with the same setup, the noise generated is waaaaaaay much lower, nearly audible...

Exactly

If you mean, "why I add the Casio in line-in of the soundcard", it's because I need both source (VST and audio-out of Casio) mixed together...

I understand what you mean but I have 2 options (because my pc does not have an internal midi interface): 1) Use the USB soundcard (it has 2 line in 2 line out and MIDI-out, MIDI-in) 2) Connect directly the Privia with PC using USB cable So there's no way to do it without USB cables...

I am already using the MIDI-out port... Thank you for the reply! :-)

Hi! First of all sorry for my bad english, I'm from Italy and I am a new user of the PX5s and the forum. I had some trouble when using my usb soundcard with pc and the privia. I want to use the internal sounds of the px5s in conjunction with a vst instrument from computer. The USB soundcard is able to mix both sources: the external sound (from line-out of the privia) and the signal generated by the pc. I connected the midi-out of keyboard with midi-in of the soundcard (to control the vst) and the line-out of keyboard with line-in of the soundcard. With this setup there is a high pitched whining noise coming from audio input, that vanish only when I unplug the MIDI cable. I know that there are some older post about this argument, labeled as "USB ground loop" but I have two consideration about: 1) if I plug midi (via USB out of privia) and line to pc directly (without external soundcard) the problem persists. 2) If I use another keyboard (an old Roland) with exactly the same setup (with the USB soundcard), there is no noise and no humming at all!! What can I do? Is the Roland MIDI better shielded? In any case, how can I get rid of this problem? Thanks to all for the attention! Bye!