A high pitched ringing sound

[phly23]

It's quiet, but annoying. I can mostly get rid of it by maximizing the master volume. AFAIK, it's always done it. Never gigged with the keyboard or transported (apart from original mail order...), so probably nothing is "loose". Interesting to see how this thread progresses!

Yes I also Have this noise proble, problem with a Triton Classic. (but not on my TEX.)

It is somewhat alleviated when volume slider all the way up...Possible Shielding Issue perhaps?

[kabuchi]

I hav the TEX
same problem, high pitch sound, happens anywhere i play with any equipment so i am supposing it cant b anything else but the TEX

hmmm

[chilly7]

Do u play it on the grave yard, do ulive in hause with ghosts and etc, if yes, i guees u might have this phenomen

http://en.wikipedia.org/wiki/Electronic ... phenomenon

I have very hight quality and sensetive recording equipment so If i exiriense such problem u say" go away ghosts" and thay are goon for some time so i can record with out any problem
if u cannot make ghost go away ask a priest from the Cristian crurch, he will help u with this problem....

[synthjoe]

I often faced similar problems with noises from various sources. I cannot guarantee, but hope that my advice will help.

To be absolutely sure that nothing else but your Triton (or whatever other device) emanates the noise I'd recommend that you take good care of connecting it to a well-grounded wall outlet as the only device (no powerstrips/multiplugs, etc.). Remove all other connections to the synth. For connecting audio use only the necessary one or two direct audio cables and connect a BATTERY OPERATED headphone or power amp to the audio output (similar to Sparker's case with the laptop in his earlier post). Obviously try volume pots at both extreme settings, also on your battery operated amplifier. Another word of warning is to watch for the case not touching another metallic object (e.g. the stand). This might also be the source of noise, so you should place a blanket or similar underneath the instrument to ensure perfect electric decoupling.

If you still can hear the noise in this configuration (wheter dependent on pot settings or not), you have a good chance that your device should be taken to a repair shop. The reason can be bad shielding, bad solder, fading caps in the grounding or the power supply filtering, etc. - too many to give a simple diagnosis.

If however, this makes the noise go away, then you know your homework: find the culprit by reconnecting/reinstating one by one the elements to your setup.

Just to give you an example: my Yamaha CVP made strange clicks when played - just at the beginning of the notes and when keys were released. It turned out to be the the seial port that was connected to an inactive computer. It somehow reflected the signal sent, and this made its way into the audio output. Serial cable disconnected - problem gone. Same with USB ports, very often I experience noise problems when something is connected, in particular so with a computer or other device with switching power supply - but sometimes even 'passive' devices (e.g. pendrive) will add noise.

Remember that the only electrically decoupled connectors on a musical instrument are the MIDI IN port (if done properly - which it usually is) and the OPTICAL (TOSLINK, ADAT, etc.) digital inputs/outputs - if there are any. Other digital connectors (COAX, AES) are sometimes decoupled also, but unfortunately this is not always the case.

BTW, the noise in the mp3 few posts earlier sounded very much like digital electronics maybe with an added whine from an inverter (backlight?), so if the noise persists when the Triton is isolated from everything else I'd start looking at grounding within the box or check caps (particularly in the power supply). Just repaired an old computer in which caps gave in gracefully (well, sort of)... Read this (affects mostly electronic devices manufactured between 2000-2005):
http://en.wikipedia.org/wiki/Capacitor_plague

[synthjoe]

Oh, and in the mp3 I seem to hear some motor noise as well - a fan, maybe a HDD?

[xmlguy]

Before you blame the TrEx, you gotta use a DI box with ground lift to eliminate any ground loop that could be causing the noise. It's also important to send a hot signal from the TrEx to a line input. If you send a low level signal and use a mic in or boost the gain later in the signal path, then you're amplifying the noise and decreasing the signal to noise ratio. Mic inputs often are noisier than line inputs because they have higher gain and an additional opamp in the chain. The line inputs on some mixers bypass the first stage high gain opamp, but you'll need to look at the mixer block diagram to confirm the configuration of the input channel.

On the TrEx you can also use the S/PDIF output to an S/PDIF on an audio IO Box to eliminate the analog signal path and any additional noise, interference, and distortion it adds, and avoid the DAC and ADC conversions. This would be a good test to see if perhaps the noise is something that's being introduced in the synth engine or not.

[synthjoe]

...you gotta use a DI box with ground lift to eliminate any ground loop that could be causing the noise.

Very true, this is usually the main cause of noise - good advice.

However, I'd recommend disconnecting all cables and using a BATTERY operated (hedphone) amp instead (as in my post above), because firstly DI boxes are not common household items, and secondly it is far too easy to forget the GND lift switch, which invalidates the use for this purpose.

Furthermore, some of the DI boxes are really dodgy, for example if you take the Behringer DI-20 or DI-4000 they don't even have galvanic isolation, just some electronic compensation - and I'm sure they're not the only manufacturer cutting costs by leaving out transformers. Any active DI box will contain a power source that is also a potential noise source, so only passive DI boxes should be considered when investigating noise issues - but even these can pick up radio frequency signals.

Some seem to have forgotten that besides matching signal levels, the primary purpose (or one of the primary purposes) of using a DI box is to provide galvanic isolation. Well, so much for ranting about 'cheap' product manufacturers...