Author Topic: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)  (Read 9552 times)

0 Members and 1 Guest are viewing this topic.

Online Elantric

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #50 on: March 23, 2014, 03:15:13 PM »
Quote
I've been getting an intermittent "mains" type hum from the vg99. In the high gain patches, it's nearly as loud as the actual guitar signal.
I don't use my mags, only the internal GK, I have a US20 feeding the 99 and a GR55, but I tried plugging the GK lead directly into the 99, without curing the problem. The GK lead is almost new.
Has anyone else had this happen, or have any ideas please?
Hopeful regards,

Yes  - its the typical  US-20 Ground loop.

Solved by using an Ebtech  Hum-X on the Roland AC power brick supply to either the GR-55 or VG-99 - only need one.

http://www.amazon.com/Ebtech-Hum-Voltage-Filter/dp/B0002E4YI8/ref=sr_1_1?ie=UTF8&qid=1395607736&sr=8-1&keywords=Ebtech+Hum-X



 

Offline VGrider

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #51 on: May 07, 2014, 02:13:22 PM »
The US-20 is too expensive!!  $220 for an A/B switch?
Could I make a ~passive one with a couple Analog Switches like the ADG1434 linked here:  http://www.analog.com/en/switchesmultiplexers/analog-switches/adg1434/products/product.html


Online Elantric

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #52 on: May 07, 2014, 02:16:59 PM »
Realize the Roland US-20 price includes two 1 meter 13 pin cables which accounts for $80 of the price of the Roland US-20.


DIY US-20 plans are here:
http://www.vguitarforums.com/smf/index.php?topic=480.0
« Last Edit: May 07, 2014, 03:02:08 PM by Elantric »

Offline datsunrobbie

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #53 on: May 08, 2014, 03:02:35 PM »
Check eBay frequently, decide what it's worth and keep bidding. I picked mine up for around $100, but I had to bid on half a dozen auctions before I finally got one at that price. I just checked their completed listings for us-20 and the lowest price I saw was a $100 on a "buy it now" listing.

Offline jshortz

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #54 on: January 02, 2015, 11:50:27 AM »
I set up my US-20 with GR-55 and GR-20 and for some reason both units stayed on when only one was selected.
Odd thing as it only happens on occasion.
My cables are clean.

Online Elantric

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #55 on: January 02, 2015, 12:10:52 PM »
Both units must have "GK Vol" assigned to patch volume for the US-20 to operate

Offline Deus02

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #56 on: January 31, 2015, 12:43:15 PM »
Both units must have "GK Vol" assigned to patch volume for the US-20 to operate

Just wondering if a switching unit exists that actually does the opposite of the US-20?  (I. E.  "2" - 13 pin ins, ONE out). 

Online Elantric

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #57 on: January 31, 2015, 03:24:01 PM »
Read the GK Accessory Area for these type products
http://www.vguitarforums.com/smf/index.php?board=13.0

There used to be the Czech CHD version
http://www.chd-el.cz/index.php?id=4#id17


And today a few ares listed here:

http://www.vguitarforums.com/smf/index.php?board=174.0


there is the PrimANova version from CodeSmart
Quote
4 guitars in (GK or std. 1/4 jack), effect loop, on board S1 & S2 switches in case you connect something without S1/S2 buttons.
12VDC power possibility in case your instruments consumes more than 200mA.

Guitar, Chapman stick, GK-violin - These yellow guys built like tanks switches Everything.

1 meter great quality gold plated GK Cable included.

Todays price including shipping:
United states: 298 USD
All Europe:     267 Euro (25% VAT included)
Australia:       333 AUD

http://www.vguitarforums.com/smf/index.php?topic=9143.0



DrJoness has his here
http://www.vguitarforums.com/smf/index.php?topic=9346.0


 
« Last Edit: April 09, 2015, 08:19:38 PM by Elantric »

Offline zapantalambda

  • Contributing Member
  • ***
  • Posts: 40
  • Total likes: 0
  • Rating: 0
  • **Teach Me How to GR55**
Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #58 on: February 06, 2015, 09:45:07 PM »
***Hello Guitar gurus & Sonic enthusiasts***

I got a question to ask
Probably a longshot but I'm just testing the waters to see if there's anyone in here who's willing to part out with their modded Roland US20?
I dont really mind if it has cosmetic wear. What i'm after is a functional unit in good working condition.
The reason being is, Im experimenting on my set-up right now and I just need the modded US20 as piece in the puzzle.
If anyone wants to let go of their unit, would yous pls let me know. thanks very much
I appreciate your help. Rgds -zap

Offline Silas Lang

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #59 on: June 17, 2015, 02:50:36 AM »
More US-20 oddity: I use it with a GR-55 and a VG-99, both with GK volume assigned to "patch volume" as stated by Elantric. It works ok until I change to a different patch (both units at the same time via midi); then, the VG-99 always sounds even if only the GR-55 is selected. If I switch on and off the pedal marked "Both". the VG-99 mutes again. It only happens with the VG-99, no problem with the GR-55 whatsoever. I don't have a clue how to solve this, anyone?

Forgot to mention: of course the assign of GK volume is "global", not "per patch".

Offline shawnb

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #60 on: June 17, 2015, 12:17:58 PM »
That sounds familiar...  IIRC, it's 'patch level' or 'guitar volume', not 'patch volume'?  So you might want to double-check. 

Note this post from earlier in this thread:
http://www.vguitarforums.com/smf/index.php?topic=2246.msg36222#msg36222

I also couldn't turn off my VG-99 using the US-20 A/B switch, due to some changes I made a while back.    I had a slightly different issue - I had my System-level GK Vol assign to be GUITAR VOLUME [A&B].   In this config, my Normal PU played thru the US-20's A&B  channels on my voices where I had the Normal PU mixed in.   I.e., the US20 properly handled the COSM guitars, but not my Normal PU.   

So one clarification I would add is this:   If you want:
    (a) control over your cosm guitar volumes (A&B), and
    (b) control over your normal PU volume, and 
    (c) a global solution because you always play your VG-99 thru your US-20

...Then you should change your System-level GK Vol Assign to be either PATCH LEVEL 0-100, PATCH LEVEL 0-200, or MIXER [A&B].   

Avoid the GUITAR VOLUMEs, as this will not provide US-20 control over your Normal PU. 
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

Offline Silas Lang

Re: Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)
« Reply #61 on: June 22, 2015, 03:21:10 AM »
Thanks for the reply, Shawnb. Yes, you're right, the actual mode selected is "patch volume 0-100". And for the "guitar volume" thing, I've never used that way, so it doesn't apply to my situation.

I've assigned gk volume to patch level and mixer without success. Maybe I have to cast a spell on the device to solve the problem!

 

Blog