Tmdj.alby Posted December 1, 2015 Share Posted December 1, 2015 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! Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted December 1, 2015 Share Posted December 1, 2015 USB ground loop is always the first suspect. If you can, use the midi din out of the PX-5 rather than usb midi. Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 1, 2015 Author Share Posted December 1, 2015 I am already using the MIDI-out port... Thank you for the reply! :-) Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 1, 2015 Share Posted December 1, 2015 yes thats fine, but also make sure the USB cable is still not connected as you will still get USB noise (even if using the midi ports) if you leave it in. Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 2, 2015 Author Share Posted December 2, 2015 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... Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 2, 2015 Share Posted December 2, 2015 Why not use the midi in and out from the casio to the midi in out of the soundcard? Your soudncard might be USB, but why add to the noise by adding the casio as well? Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 2, 2015 Author Share Posted December 2, 2015 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... Quote Link to comment Share on other sites More sharing options...
Choppin Posted December 3, 2015 Share Posted December 3, 2015 Tmdj Do you mean: PX-5S --> MIDI Out 5 pin --> MIDI In 5 pin Sound Card Sound Card --> USB --> Computer USB Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 3, 2015 Author Share Posted December 3, 2015 Exactly Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 3, 2015 Share Posted December 3, 2015 So going by this, you are NOT using the PX5 USB out at all, just the USB of the soundcard, yes? In which case the noise is being generated from your PC/USB interface and not the PX, ne c'est pa? Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 4, 2015 Author Share Posted December 4, 2015 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... Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 4, 2015 Share Posted December 4, 2015 hmmm...I use the PX 5 MIDI in/outs (no USB) and have no probs with noise at all...I also sometimes use an old A-70 with the same MIDI in to the PC and again no noise....your problem certainly seem atypical for sure. Quote Link to comment Share on other sites More sharing options...
Brad Saucier Posted December 4, 2015 Share Posted December 4, 2015 Jumping forums for more info...might wanna read this... http://forum.cockos.com/showthread.php?t=113721 Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 4, 2015 Author Share Posted December 4, 2015 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! Quote Link to comment Share on other sites More sharing options...
Display Name Posted December 4, 2015 Share Posted December 4, 2015 I would try MIDIing to the PX-5S 1 Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 4, 2015 Share Posted December 4, 2015 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! On the PX are you using the mini-jack or the Line-Out jacks L/r ? and the USB on the PX is not plugged in? If this is so then again I say the noise is being caused by the USB soundcard and your PC's USB bus, NOT the PX. Until you sort the USB noise issue on your PC it will stay the same. What sound card are you using? Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 4, 2015 Author Share Posted December 4, 2015 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... Quote Link to comment Share on other sites More sharing options...
Choppin Posted December 5, 2015 Share Posted December 5, 2015 Check the power source for the px. plugged into the wall or an extension cord? try a different wall outlet. are you using high quality cables from the line out? Quote Link to comment Share on other sites More sharing options...
Display Name Posted December 6, 2015 Share Posted December 6, 2015 Yes check the cable. (y) Quote Link to comment Share on other sites More sharing options...
pax-eterna Posted December 6, 2015 Share Posted December 6, 2015 Further to Scott and Choppin - also make sure the USB cable does not either cross or run close to a power cable. Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 6, 2015 Author Share Posted December 6, 2015 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? Quote Link to comment Share on other sites More sharing options...
Tmdj.alby Posted December 6, 2015 Author Share Posted December 6, 2015 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... Quote Link to comment Share on other sites More sharing options...
Display Name Posted December 6, 2015 Share Posted December 6, 2015 I'd try the cable. Quote Link to comment Share on other sites More sharing options...
hrestov Posted December 7, 2015 Share Posted December 7, 2015 What audio interface? Try try to change it with another, maybe it solves the problem. Quote Link to comment Share on other sites More sharing options...
Display Name Posted December 7, 2015 Share Posted December 7, 2015 ^^^ THIS! ^^^^ I would also try the cable. Quote Link to comment Share on other sites More sharing options...
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