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GK-13 Reference Knowledge => GK Hardware Tools => DR WAYNE JONESS => Topic started by: drjoness2001 on August 07, 2013, 12:07:17 PM

Title: DR_JONESS -UX-20 Combines US-20 + GK Switcher Buffered EFX LOOP
Post by: drjoness2001 on August 07, 2013, 12:07:17 PM
OK!

There is a new, UX-20 listed on ebay:

http://www.ebay.com/itm/141031483660 (http://www.ebay.com/itm/141031483660)

While my primary intention is to sell the UX-20 as a DIY PC board, I did make a few units fully assembled for sale. Starting bid is $99.

Thanks! Wayne

http://youtu.be/UNxphUB58Jc (http://youtu.be/UNxphUB58Jc)

http://youtu.be/KQJmfMr_pjc (http://youtu.be/KQJmfMr_pjc)

http://youtu.be/BYDFOqMkcBI (http://youtu.be/BYDFOqMkcBI)
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: mojo thorne on August 14, 2013, 03:35:09 AM
Hopefully you'll have a few more of these go up for sale/auction!
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: mockchoi on August 14, 2013, 11:21:59 AM
I missed this post (Why doesn't the 'show unread posts since last visit' work anymore?)  I'd sure like to buy on of these.
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: nervoteso on November 03, 2014, 06:50:21 AM
hi,

i would like to buy the ux20 to connect more devices. i've tried to contact the guy at the official site but i did not ant reply. does anyone know where i can buy it? i live in italy
thanks
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: Mikko127 on December 22, 2014, 05:30:58 PM
Hi all senior members,

Does anyone know how I can get hold of one of the UX-20?
I email Wayne jones but no response, check on his website and it seems he's trying to finish his degree.
Does anyone have one for sale they're not using?
Or perhaps some schematic? Soi can have some engineer build one for me.

I really this for a gig coming up in February. I reside in Los Angeles.

Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: Elantric on December 22, 2014, 05:33:58 PM
Equivalent products are available from Codesmart or RMC

Browse here for details:
https://www.vguitarforums.com/smf/index.php?board=127.0 (https://www.vguitarforums.com/smf/index.php?board=127.0)
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: Mikko127 on December 22, 2014, 05:44:20 PM
Thank you so much Elantric! You're a life saver.
Title: Re: UX-20 Combines US-20 + GK-Expander 13-pin Switcher ww/ Buffered Input EFX LOOP
Post by: drjoness2001 on December 30, 2014, 08:13:21 PM
Sorry for the delay and the trouble getting in touch with me! I saw your message, and your urgent need, and listed a UX-20 for sale on ebay:

You can buy it now, and I can ship tomorrow.

http://www.ebay.com/itm/141525146500 (http://www.ebay.com/itm/141525146500)

I am working right now to get through my back log of emails and such.

Thanks! Wayne

Quote from: Mikko127 on December 22, 2014, 05:30:58 PM
Hi all senior members,

Does anyone know how I can get hold of one of the UX-20?
I email Wayne jones but no response, check on his website and it seems he's trying to finish his degree.
Does anyone have one for sale they're not using?
Or perhaps some schematic? Soi can have some engineer build one for me.

I really this for a gig coming up in February. I reside in Los Angeles.
Title: Re: DR_JONESS -UX-20 Combines US-20 + GK Switcher Buffered EFX LOOP
Post by: admin on October 01, 2018, 09:15:43 AM
(https://ecp.yusercontent.com/mail?url=https%3A%2F%2Fgallery.mailchimp.com%2F3975311714649b71172eb5770%2Fimages%2F2bf31839-ff71-4dbd-9134-a7e9292ff2c7.jpg&t=1538410398&ymreqid=5bf827ce-ba3c-3ace-1318-710000010000&sig=qg6LgyaChC657AcrETO_Vg--~C)


UX-20 - 13-Pin Splitter/Distributor with Buffered Guitar Input
Download and build your own UX-20.
The UX-20 incorporates greatly expands on the functionality and features of the original Roland US-20.

While the US-20 sends the same GK commands to both synthesizers A and B, the UX-20 allows for a variety of configurations for independent control over Synthesizers A and B. This includes independent GK Synth Volume control, and independent GK S1/S2 commands.

The UX-20 includes a buffered guitar input, based on the buffered input circuit from the original GK-Expander. This enables non-GK equipped guitars can access the effects and COSM amp modeling in guitar synthesizers like the GR-55.

The input circuit was primarily developed so that non-GK equipped guitars could access the COSM guitar amplifier modeling and effects in the Roland GR-55 guitar synthesizer. When GR users realized the GR-55 did not have a standard guitar input, like the Roland VG-99 does, the easy solution was to cut open a 13-pin cable, and just wire a 1/4" guitar jack to pin 7, the guitar signal.

However, because of the impedance mismatch, this sucked all the tone out of the guitar signal. It sounded terrible. The UX-20 solves this problem with no loss of guitar tone. The buffered input on the UX-20 can also act as an effects loop, providing a high-impedance buffered input and output, using a tip-ring-sleeve cable.
Download the UX-20 Schematic


https://www.joness.com/gr300/UX-20.htm
https://www.joness.com/gr300/pdf/UX-20_Roland_US-20_Clone_Schematic_wayne_joness.pdf