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I'd hate to see all of us lose touch due to Yahoo killing all of the Yahoo groups. Does anyone have any ideas on how to keep this group alive- elsewhere? Thanks Tony

Someone on the AH list is asking about how to remove the matte finish from an Xpander and while I found some photos I can't seem to find the info on how to do it. I vaguely remember that it's not all that difficult but I can't find any instructions. Anyone know where it is? Gloss finish Matrix 12, for reference: https://www.matrixsynth.com/2016/09/vintage-analog-oberheim-matrix-12-with.html Thanks, Seth

Please, here are some Oberheim Xpander tracks from SoundCloud: https://soundcloud.com/nycsynth/stay-with-me https://soundcloud.com/stephen-richard-williams/xpander-bliss https://soundcloud.com/zapgalaxy/jan-2014-studio440 https://soundcloud.com/paolo-dollorenzo/acidfromscratch-part-4 https://soundcloud.com/c1t1zen/end-credits https://soundcloud.com/noiseprofessor/xpander-demo https://soundcloud.com/jnln/regalish https://soundcloud.com/wheatfield-1/power https://soundcloud.com/fluxusanais/the-universe-in-a-nutshell https://soundcloud.com/modularsamples-com/little-chord-4 https://soundcloud.com/modularsamples-com/simple-mod-saw https://soundcloud.com/uvi-official/synth-anthology-ii-san-juniperan-by-torley Tiitu

Hello there! I just bought a Xpander but the voices are all messy .. the tune test fails on every voices and there is no bass sound. The notes are the same below C3... vcf is OK but I don't know how to test the DAC..?

Hi all, I've been in some discussions with Doug @ SynthArk about creating a bespoke controller for the Xpander/M-12. He has completed a mockup which I am sharing the details of below. These are by no means set in stone, but are a pretty good indication of what the final product would look like. Certainly get in touch with him if you want one, or we can discuss any possible changes here. "I finished the Matrix12/Xpander programmer layout design (see attached). Large circles are knobs, small circles are switches, and skinny rectangles are LED sliders. Here is the class description: "x" (3U, $256 retail): LFOs, Envelopes, Ramps, and Tracking Generators have shared controls, which is great if you want to set parameters for more than one, but can be annoying when bouncing between them. No Matrix modulation or Multi-Patch editing is supported. "y" (6U, $640 retail): Same as "x", but adds Matrix modulation (1-16) and Multi-Patch editing. "z" (9U, $896 retaill): Dedicated controls for LFOs, Envelopes, Ramps, and Tracking Generators, along with Matrix modulation (1-16) and Multi-Patch editing. I would need at least 10 pre-orders before I can bump the priority to Q2 (April-June). I can extend the 20% AH discount to pre-orders, bringing the price to $204 for "x" class, $512 for "y" class, and $716 for "z" class (+shipping). Just have anyone interested contact me directly and mention you."

Hi, Does anybody know, if there are anywhere available spare Xpander buttons, originals or compatible? I might be even willing to trade a CEM3374 or a display for buttons - if sale is not an option. Merry Christmas to All! Tiitu

Bought a great Matrix12. Couldn't be happier. However: previous owner messed up patches - so I want to reload original factory patches (single.multi). Have read everything about this...but simply can't get it done. I am using sysex libririan and a ESI M4U midi interface. Would be really greatful for you help! Txxx Jose

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the xpantastic group. File : /Patch Banks/gwaldisp.syx.zip Uploaded by : gwaldispuehl <geri77@...> Description : You can access this file at the URL: https://groups.yahoo.com/neo/groups/xpantastic/files/Patch%20Banks/gwaldisp.syx.zip To learn more about file sharing for your group, please visit: https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards, gwaldispuehl <geri77@...>

Hello Karl ! I received your email days ago and replied. Again,- after some days I got the mailer demon "mail delivery failed ..., permanent error". Unfortunately youre the only one I cannot send emails and it happens since Yahoo changed something. In the attachement youll find the note according to mail delivery error. Maybe youre able to contact your provider and fix it. I keep it short here cause I dont think its the place discussing our private stuff. So, take it as some emergency notification via Xpantastic cause I dont see any other way contacting you a.t.m.. thx PeWe

Hi all, curious if anyone has come across an issue where individual voice volumes on their xpander/M-12 are not the same? On my M-12, I have one voice in particular that is about 1dB quieter than the rest. It's not really noticeable in use, but was also just noticeable enough for me to become aware of it. I should note that all of the voices are slightly different volumes when you actually start measuring them, but most are so close as to be a non-issue. If anything, it seems like one voice board (1-6) is slightly quieter than the other, but it passes on the VCA calibration (and everything else) so I'm wondering if it's maybe a parts tolerance thing that just hasn't gone out enough yet to cause the calibration to fail. I probably won't try and "fix" it for now, but it would be good to know in advance what the culprit might be. I.e., is this happening at the board level, or the voice level?

I have a Matrix 12 and it's in great shape, but while idle, or while playing, it randomly outputs a little click. It's very random. Sometimes every 5 minutes, sometimes not for hours. I've replaced the battery and started reseating a bunch of IC's from the CPU/programmer board. Any thoughts on what this could be?

Hi, I have recently noticed that VCO2 on voice 9 on my Matrix 12 has developed a problem where the pitch is always the same regardless of the note played. The problem is not apparent on VCO1 which works as expected. At first I suspected it was a problem with the voice chip.. but having switched boards around I see that the problem is always voice 9. So I suspect the problem is elsewhere.. is there something on another board which is responsible for pitch tracking... could the cable connector to the lower board be the problem? Just asking in case anyone has had a similar problem. Regards Neil

Hi folks, I'm willing to pay $100 to the person who can generate a random patch, and make the patch play from the keyboard instead of just a one-shot with no scale. This would be a modification to the Xplorer software, and the source is now available. Cheers, Jeremy.

I'm trying to understand the calculations that the single patch browser (included with Xplorer) ueses. Looking at XpanderSysEx.h // Single patch data sysex length is 399 bytes// 6 bytes for sysex intro: F0 10 02....static const int PRG_DUMP_DATA_FOLLOWS_INTRO_LENGTH = 6;// 188 double bytes data for the values and 8 double bytes for the patch namestatic const int PATCHNAME_LENGTH = 8;static const int OBWORDS_DATA_LENGTH = 196 - PATCHNAME_LENGTH;// 6 (intro) +196*2 (data+name) +1 (EOX) = 399 I understand that PRG_DUMP_DATA_FOLLOWS_INTRO_LENGTH is for the Sysex cmd overhead to request a single patch, however, I don't understand why he subtracts the patchname length from 196, when the patch name is part of each single patch. 196 & 2 + 8 = 399 bytes, which is correct What am I missing?

Hi. Is there anyone who knows how to safely open up an Xpander panel switch, i.e. remove the switch cap? /M

Hi all, looking to trade or sell a few CEMs--I've got 9 new old stock 3372 B series chips; I need 3 C series. I would trade 3 for 3 C series and sell the rest if possible. If someone wants to buy all of them, I can definitely do that, but I'd defer to a part-trade first if possible. thanks! Matt

Hi, The Xpander/Matrix-12 editor Xplorer is now free :) You can find the latest version and the license on the website: http://xplorer.programmer.free.fr/?page_id=15 Regards,

Folks! on Autotune I get a Fail on Voice 9. How can I check which is Voice 9 on the voice boards? inside the Matrix 12 I see 2 identical boards one on top of the other with voices labelled 1-6 on each. Is there a way to identify which section is for Voice 9? Thanks in advance.

Hi folks, Here's my new album : https://straightouttamongolia.bandcamp.com/album/mutant-pop-lp I'm just posting it here because I need some people to listen to it - and buy it! 'What Is Life' is not the Xpander, but the Korg Z1. Cheers, Jeremy.

Hi folks, Soon after I got my Xpander, I had it on 110v and plugged in a 240v cable. The fuse blew and I got some new fuses from Maplin. It seemed to work okay afer replacing the fuse. My question is: Could the power surge blowing the fuse, have damaged the voice chips? I'm convinced it doesn't sound as 'fresh' as a functional Xpander. Cheers, Jeremy.