GR-55 F.A.Q.

Started by Elantric, February 12, 2011, 03:37:17 PM

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GR-55 response slows down with USB connected to computer
https://www.vguitarforums.com/smf/index.php?topic=7667.0

Gumtown wrote>
An old post but a bit of a revelation playing with USB midi into a Raspberry Pi, same could apply to mac osx.

I found that my GR-55 virtually locked up as soon as the USB cable was plugged in, a patch change took about 30 seconds from the pedals or dial and the menu unresponsive.

The result !!
Some USB midi connections cause a loopback from GR-55 midi out back to GR-55 midi in.
I found if either System setting for Midi PC RX or Midi PC TX is 'off' then the problem goes away.
It is an eternal Program change loopback, the GR-55 does not have the option to have TX or RX program change on different channels.

admin

If you are clueless about all these GR-55 PCM Synth parameters and settings and how they inter-operate:

Looks like the Roland SD-90 Studio Canvas Owners Manual is a Must Read for GR-55 Owners interested in mastering the Roland PCM Synth Engine.
http://lib.roland.co.jp/support/en/manuals/res/1811325/SD-90_e3.pdf




see this post and download the Analog Synthesis Primer by Martin Russ
https://www.vguitarforums.com/smf/index.php?topic=6418.msg44034#msg44034


and

Gordon Reid's SOS Synth Secrets series
http://www.soundonsound.com/sos/allsynthsecrets.htm

bryanz

Thanks sustainiac--if there's anything in those doc's that you found particularly helpful, I'd be interested to hear it! :)

admin

Quote from: bryanz on May 09, 2018, 08:49:13 AM
Thanks sustainiac--if there's anything in those doc's that you found particularly helpful, I'd be interested to hear it! :)

IMHO its essential to read ALL these



---------------
If you are clueless about all these GR-55 PCM Synth parameters and settings and how they inter-operate:

Looks like the Roland SD-90 Studio Canvas Owners Manual is a Must Read for GR-55 Owners interested in mastering the Roland PCM Synth Engine.
http://lib.roland.co.jp/support/en/manuals/res/1811325/SD-90_e3.pdf




see this post and download the Analog Synthesis Primer by Martin Russ
https://www.vguitarforums.com/smf/index.php?topic=6418.msg44034#msg44034


and

Gordon Reid's SOS Synth Secrets series
http://www.soundonsound.com/sos/allsynthsecrets.htm

admin

#79
GR-55 - DIY External MIDI control of GR-55 CTL Hold w/ relay



Quote from: gumtown on January 01, 2018, 12:19:37 PM
I recommend fit an isolation device in the GR-55 (opto-isolator or old fashioned relay).
Justin Morrell wrote >
I know next to nothing about how these work, but from what I understand about an opto-coupler, I would need power to the transmit side from the GR-55.  Since the transmit side would be electronically isolated from the GR-55 CTL pedal, could I then pull the power directly from the incoming 9V DC power supply -- assuming the opto-coupler is rated for 9V?

Would something like this do the trick? 



https://www.amazon.com/dp/B00LW15D1M/ref=asc_df_B00LW15D1M5322843/?tag=hyprod-20&creative=395033&creativeASIN=B00LW15D1M&linkCode=df0&hvadid=167156423255&hvpos=1o1&hvnetw=g&hvrand=6225547994649594431&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9006604&hvtargid=pla-343992463804


Just a quick update.  I picked up one of those relays I linked in my previous post.  I think they're designed to be used with Arduino stuff.  Anyhow, I wired a 10k resistor across the "in" and "DC+" contacts.  I then wired my 1/4" jack to the "in" and "DC-" terminals.  I pulled 9v DC off of the internal GR-55 power right from where the power supply plugs in (had to pull the board up and wire it from underneath).  I installed the jack on the inside of the USB door, and since it's plastic it keeps the jack isolated from any ground issued within the GR-55.  Of course I also wired the "open" and "common" terminals on the relay board to the terminals at the underside of the CTL pedal.

It works great so far.  I can now trigger the GR-55 CTL pedal remotely from my Boss MS-3 amp CTRL Jack .  Thanks again for your collective input!

Justin Morrell

whippinpost91850

Does anyone know how to detach the LCD screen from the frameof the GR55

gumbo

How about this?
Read slower!!!   ....I'm typing as fast as I can...

whippinpost91850

Now that feels like the appropriate Tool :)

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bryanz


admin


admin


Crazystrings

For years I've noodled with a minimum of parameters. But finding this site and it's humongous knowledge base and intelligent participants willing to help, I find myself going deeper into my GR55.

Suddenly, I'm not so intimidated.

I am having more fun with the unit now.

Thanks to you all!
👍👍👍👍👍👍👍
Fender American Strat 1992 w/GK3
Godin Nylon Multiac SA
Washburn J6 archtop
Taylor 510 Dreadnaught
Taylor  K24ce
Roland GR55
Boss SY-1
And a whole lot of stuff!

Elantric

https://www.vguitarforums.com/smf/index.php?topic=3912.msg53452#msg53452
I'm using these settings below with much success using my 2012 Godin xTSA (RMC) and stock GR-55 (rev 1.50 firmware ) and Boss GP-10

Thanks Jim Williams!



On both my xTSA'a - the COSM Modleling sounds most excellent .

This is AFTER I follow Jim Williams Piezo Setup.

--
In System, Set the GK PU type to:
PU type ;  PIEZO R
Scale :  ST
PU phase : NORMAL
PU direction : NORMAL
S1/S2 position : NORMAL
NORM PU gain : 0 dB
PIEZO TONE  LOW  :    -2
PIEZO TONE HIGH  :   -3

"DIS"
10.0 mm all strings (does not matter GR-55 ignores this for all Piezo PU selections)

"SEN"
Set the sensitivities for all strings to "50" average (+/-5  - that is all my strings have sensitivity set in the range between 45-55 .
(Note: Godin's older than 2012, might work better with Sensitivity set to "0")

"VEL"
Velocity Dynamics :  2
Play-Feel         :  2 (may vary depending on how you play synth tones)
Low-Velocity Cut  :  8-9

"NUA"
Nuance Dynamics   :  4
Nuance Trim       :  4

"DOW"
Shift   :   0
===============


Be sure you are using Headphones when forming opinion on the sounds  / patches of your Roland gear.!!


Ive voiced prolifically on this forum my preference for GK-3 type pickups for use with Roland COSM Modeling systems , but there have been some minor incremental developments  / improvements in the RMC electronics over the years. I admit bulk of my prior opinions on RMC piezo pickups were based upon a 1998 era RMC Piezo Polydrive 1 install in a Les Paul feeding  a Roland VG-8, where I could always "hear" the underlying RMC piezo characteristics in the VG-8's output, regardless of any patch or tweaking.

In contrast, the GR-55 with firmware 1.50 , and using Jim Williams Piezo setup suggestions

https://www.vguitarforums.com/smf/index.php?topic=3965.msg53317#msg53317

and string sensitivity at an average of "50" for all strings with this new Godin xTSA - the GR-55 sounds wonderful. True the GR-300 preset still has low frequency handling noises and random noises, (the optional RMC OPT-01 sub filter board should cure this) -


In context when using only the 13 pin cable. The Godin's Normal Mag PU"S (Or Mono Piezo Signal  - depending on the guitar volume control settings) will  feed pin #7, on the 13 pin cable where the GR-55 can act as a "GT-100 like" COSM Amp Modeler. All audio output occurs at the GR-55 Stereo Output jacks.
My first order of business was modifying ALL GR-55 User Presets to enable the use of the Godin's Normal pickups and enable use of the three way "Guitar / Mix / Synth" switch on the Godin - and for me, thats where the magic of the GR-55 happens. Many factory GR-55 patches become 300% more useful.
For example, one GR-55 Xylophone patch had a great multitap delay that when used with only straight normal pickups becomes a wonderful world of great tone where the Roland COSM Amp modelling and effects can be appreciated.

I do think the only way to go with the GR-55 is to use an external stereo Volume pedal, and then dedicate the on board GR-55 Expression pedal to "pan / morph" different effects / tones within a single patch. I also find that the xTSA and RMC Piezos and GR-55's Acoustic Modeling sounds very excellent !

But I also notice that with little effort, palm Muting IS possible and get very close to the sound of the Normal pickups.  Finally having a working  "Guitar / Mix / Synth" switch on the Godin  allows instant verification and reality check on the COSM Guitar Modeling and for me opens up worlds of usefulness for the GR-55.