GR-55 - bad buzz from guitar out to my amp

Started by katmando64, June 09, 2015, 02:33:05 PM

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katmando64

Hi all.
i am new here. Bought the GR 55/GK 3 over the weekend and am noticing that there is a bad hum from the guitar out on the gr 55 to my amp. if i plug my guitar straight into my amp (no gr 55) my amp is quiet and is always that way as i am very picky about hum. Phoned Roland, but no call back as of yet. anyone any suggestion?  btw i'm using new brand cables all around..they all work fine.  and NO it's not singlecoil hum..strat hss, but does sound like a ground loop hum???  anyways..anyhelp much appreciated.
Thanks in advance
Cheers!
Kat

Elantric

Read:

Fix your Audio Ground Loop Buzzes and Noises
https://www.vguitarforums.com/smf/index.php?topic=2078.0


and

USB Noise - audio output has enormous noise with USB cable connected
https://www.vguitarforums.com/smf/index.php?topic=367.0

gumtown

If you are using the GK-3 pickup - hopefully you have the short 1/4" jack patch lead from the guitar regular jack to the GK-3 inserted?
The guitar requires this to ground everything.
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/

Fusion

So if I am not using the guitar pickup patch into the GK3 I am not grounded?
I separate the two using a std guitar cable to my guitar board and the 13 pin to the GR. I have zero noise issues but also not using a guitar amp per se' on my guitar rig. Could the noise some experience be an impedance mismatch from the GR out, isn't it a buffered out as well?
Seems a little odd. I really do not know why Roland did not put a post effect loop on this unit. Other synth models had them, wondering why they left it out on the 55?
I've been pondering the pre US20 effect loop mod and wondering if this is not problematic to running before the PCM and Modeling interfering with the tracking and enveloping of the signal processing. Seems the unit was intended to take a clean signal to more accurately process the signal.
"Long ago in days of old when magic filled the air..."

gumtown

A separate lead from the guitar normal pickup output jack to a pedal board is fine, as there is still a ground connection.

But if the guitar jack is not used at all (relying on only the GK modeled tones), then the guitar bridge and strings and all other metal parts on the guitar are not grounded, causing noise to be emitted into the GK hex pickup.
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/

katmando64

Yes I am using the short cord from gk3 to guitar, roland called me today..said it might be guitar out issue wants me to return it. I always seem to run into this. ???

Elantric

#6
I'd try one of the audio isolation transformers detailed here first

Fix your Audio Ground Loop Buzzes and Noises
https://www.vguitarforums.com/smf/index.php?topic=2078.0

katmando64

Do they make that in a 1/4 connector? or only RCA? seems silly to try and beat down the hum whilst attaching several 1/4 to rca adaptors..not sure. Don't want to return it but as it is i can only use half of the unit.

Elantric


katmando64

Hi again, It seems the Nexxtech Ground Loop Isolator Adapter (the source) is no longer being made. impossible to get one in western Canada???

Elantric

#10

Fix your Audio Ground Loop Buzzes and Noises
https://www.vguitarforums.com/smf/index.php?topic=2078.0


and

USB Noise - audio output has enormous noise with USB cable connected
https://www.vguitarforums.com/smf/index.php?topic=367.0


https://www.vguitarforums.com/smf/index.php?topic=367.0