Roland US-20 A/B Selector BUG (Importance of GK-VOL Assignment)

Started by Moonpool, January 28, 2010, 03:16:11 PM

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Elantric

QuoteI'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




VGrider

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


Elantric

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:
https://www.vguitarforums.com/smf/index.php?topic=480.0

datsunrobbie

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.

jshortz

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.

Elantric

Both units must have "GK Vol" assigned to patch volume for the US-20 to operate

Deus02

Quote from:  Elantric on January 02, 2015, 10:10:52 AM
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). 

Elantric

Read the GK Accessory Area for these type products
https://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:

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


there is the PrimANova version from CodeSmart
Quote4 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

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



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



zapantalambda

***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

Silas Lang

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".

shawnb

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:
https://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

Silas Lang

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!

rowka

My US-20 GR-55 problem:

I've got the US-20 connected to a VB-99 and GR-55.  Both units have the GK-VOL set to (V-Bass Level) and (Patch Volume).
GK-S1 and GK-S2 work as expected on both units.
The VB-99 behaves as expected.
The GR-55 ONLY sounds when BOTH is selected on the US-20.  Regardless of whether it's hooked up to A or B on the US-20.
Additionally, when BOTH is off and I switch the A/B to the GR-55 it sounds for the briefest moment before going quiet.  Again, regardless of whether it's hooked up to A or B on the US-20.

Thoughts?

admin

Quote from: rowka on February 01, 2018, 05:32:22 PM
My US-20 GR-55 problem:

I've got the US-20 connected to a VB-99 and GR-55.  Both units have the GK-VOL set to (V-Bass Level) and (Patch Volume).
GK-S1 and GK-S2 work as expected on both units.
The VB-99 behaves as expected.
The GR-55 ONLY sounds when BOTH is selected on the US-20.  Regardless of whether it's hooked up to A or B on the US-20.
Additionally, when BOTH is off and I switch the A/B to the GR-55 it sounds for the briefest moment before going quiet.  Again, regardless of whether it's hooked up to A or B on the US-20.

Thoughts?

check "Assign Hold" setting on GR-55

rowka


rowka

I can totally work around it, but it seems odd.

Unless, I'm just not finding the correct "Assign Hold" on the GR-55.  The only place I found it is under General Midi, which seems an odd place for it.