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Anyone using Xplorer on OSX yet btw per below btw ? http://xplorer.programmer.free.fr/bb/viewtopic.php?id=10

Until recently I had my my Xpander on its own midi buss, but due to some setup thinning out, it now needs to share a midi bus (1 Midi out from a Emagic MT-4) with other synths but I cannot seem to set it correctly in single mode to receive on just one midi channel, it wants to respond to all channels, could someone please go over these steps with me please, I must be missing something. Thank you, e OB Xpander Processor v1.2 Voice v1.4 Casette v1.0

Ok, I got it now Karl, how frustrating all these steps! : ) The key here is the Zone button under Master page that you mention which was set to Omni for all 3 zones. Changing this to the desired channel worked and everything is good now. I was confusing the CV/Midi and Zone as one button not two. Appreciate the help! e

Hi Xpander users I noticed that my Xpander makes quite a loud humming noise just sitting close to it and when playing electric guitar right next to it makes the guitar signal really noisy. I had it at my techie for almost a year but I cant remember it made such a loud hum sitting close to it or that it interfere with my guitar. I have a lot of equipment but the Xpander makes the most noise and I can actually hear the humming across my room when there are no speakers on at all. Apart from that it works great ! Could anyone confirm that this is normal or not ? Thanks

http://www.youtube.com/watch?v=nZ_tj1aQsnU&list=UUaE4K7yjn9XY_dGvbjIjTJQ&index=8 That mellow pad at 01:42 Thanks

Hi! I'm still looking for an encoder replacement. I'm surfing on the mouser website (http://www.mouser.com/) and there are a lot of mechanical incremental encoder. Instead of the ALPS, that doesn't offer a real 1:1 replacement, I've found a Bourns model: PEC11-4220K-N0024. It's a 24 pulses/24 detents, 20mm shaft lenght, knurled profile, no switch, metal shell.....in other words these encoders are REALLY IDENTICAL to the original ones! Am I wrong? And if you want, there is the "no dentents" version... Have a nice week end! Stefano

Hi folks, I just bought the Xplorer software from http://xplorer.programmer.free.fr/ It's very good. It only just fits my 1280x800 screen, but it does fit! The randomise patch function is a lot of fun. I'm now convinced my Xpander can do those Human League - Romantic sounds! I will post again once I've started programming the synth properly. Cheers, Jeremy.

Hello, I'm currently testing my Xpander CPU board replica. All is working fine but... - when I'm testing the MEM, it reports RAM0-2 as BAD (it should be OK). - When I'm testing ROM version, it reports 4.4 for the tape firmware (it should be 1.0). So, since I do not already have a Voice board, I want to know if someone can test his Xpander with the voice board unplugged. Thank you.

Hi all, Just back from a few day?s of Holiday. Got a new DAC, and now the Matrix-12 is working perfectly! All auto- tuning procedures complete all right, and everything is in tune. I will do some final outside service tomorrow (install new rubber feet and some new hardware), and this M-12 will be like new. Terje Winther terje.winther@... http://www.wintherstormer.no/

"Hover" type sound! Funny name, but true! I am too old to be into techno detuned sound (it really sounds "out of tune" for me), but now and then I have patched up my modulars and monophonic analogs in a massive collective sound. The idea came from a reading of what Rick Wright in Pink Floyd did, overdubbing his minimoog multiple times so he had like 18-20 VCOs sounding. You need to be careful to really have everything in tune, and play well (or use sequencers), and you can achive a slightly different sound. It is a lot of work just to get a slightly different sound, but can be worth while, as long as you don?t overdo it. I agree: detuning should be used very subtly. Terje Winther terje.winther@... http://www.wintherstormer.no/

Hi Tony, If memory serves, the Roland Juno Alpha was famous for this. This tutorial shows the programming of one. On the Matrix 12 No less :-) http://m.matrixsynth.com/2012/06/matrix-12-xpander-tutorial-3-modulation.html Best Karl ___________________________ To: xpantastic@... Sent: Mon, July 16, 2012 10:43:33 PM Subject: Re: [xpantastic] The pure size of the Matrix-12 I've been a fan of electronic music since the late 70s. I have to admit I've never heard the reference to "Hoover sounds". Would someone point me to an MP3 or YouTube example of that? (a time reference within that mp3 or video would be helpful too) thanks

Thanks to all on this list for the kind help in debugging the Matrix-12. The kindness and the high level of expertise is really appreciated. I have learned a lot. I have also had a little bit of time to play with the Matrix, and I can see why many people prefer the Xpander. The Matrix-12 is huge in all manners of the word. It is physically big, heavy, and just the depth from front of the keys to the rear is staggering. Most other analog polysynths are small by comparison. Also, the sound when using all 12 keys are almost over the top. I originally thought that having an Xpander with "only" 6 voices would be limiting, but now I know that used in a musical context, that is plenty. Also: the Xpander do not have to boggle with the dual voice cards, the keyboard and all that. Thinking about it, I am not really sure I want a Matrix-12, but I must say that I am getting really interested in getting myself an Xpander. My music is typically "old school", and I use a lot of analog modular synths, step sequencers and floating pads, and the Xpander would be perfect for that kind of music. The depth of modulation is really good, and I must say that for once the sale pitch is correct: it is almost like a polyphonic modular synth. I don?t know many other analog synths that can modulate the VCOs with so many modulators, and have the modulators being modulated by something else, that in turn are modulated again. Just having two different LFOs for each of the VCOs pulse width modulation is already luxury, and when you start using several moving modulation patchs into pitch, pulse width and VCF cutoff fluxuation, the livelyness of the sound is just beautiful. Technically I am also quite impressed with the tuning stability (when it works...). On the scope I can see how the pitch correction works in the first few minutes after power-up, and how it works while I am playing. I know how hard it can be to have analog VCOs track over 5 octaves (I regulary calibrate my own modular VCOs), so yes, I am impressed by what this machine can do. I see on the ?net that an Xpander will easily cost me around 3.000 dollars, while a Matrix-12 is only marginally more expensive. Hm. I will have to do some more repair work before I can even consider buying one. So one day, then. Terje Winther terje.winther@... http://www.wintherstormer.no/

Hi All, -omar This is true. You can set all the zone stuff up ( globaly) in the master page section, however these settings are not output with a patch dump. Patch dumps only send single patch and multi patch settings, none of the master stuff. AFAIK The Matrix 12 works the same way as the Xpander. You can assign any number of voices ( up to 12 ) to one of the 6 Zones. I have owned a M12 for a long time. I find the modulation List a great thing, but I don't see the detune as that much of an advantage, unless you just gotta have a "Hover" type sound. Often I have adjusted the detunes to what I think is a perfect sound, only to reset them all to 0 once I play the sound with a band or midi sequence context . Best Karl

Hi all, Thank you very much for all the feedback and the hints of what to do. After a day?s break from the Matrix-12, I once again got into it with renewed energy. I *might* have found the error, but I am not sure. To recapture: Today a took both voice cards and swapped positions of the "board ID" tag (strap). Earlier there was always voice 7 - 12 who failed, and after the swap, voice 1-6 failed. So there is no doubt now: There is an error on the voice card. I swapped the straps back to the original positions, and inserted the cards and tried a few other options: - I tried new 4051 ICs at UX06 and UX07 on one of the voices. No change. - I tried new TL084 at UX08 at one of the voices. No change. - U108 (LM311) have been swapped. No change. - I have swapped all critical ICs U812 to U815 with the working voice card. No change. - I have swapped the processor U907 and the timer IC U921 with the working voice card. No change. Voice card two (the upper card) fails on all 6 voices as regard to VCOs, VCFs and VCAs. It comes close, but not perfect (off by as much as 0,5 - 3 notes). On the other hand, this is what is working: - There is sound from all 12 voices (if I override the automatic tuning and turn all voices manually on) - All 12 voices responds to keyboard, levers and such - All 12 voices change sound according to the stored programs, and changes done on the front panel - All voices pass tuning of PW (Pulse Width) and RES (filter resonance) So I started backtracking to other ICs, and I might have found the error: U811, the 3140 DAC chip. If I swap this between the voice card with tuning error and the working voice card, the tuning error follow the chip. Kind of strange, since all other activities also goes through that chip, and all other activities work as they should. Moving ICs before and after U811 changes nothing, but moving the 3140 DAC makes the tuning error move as well. So I am tempted to borrow a 3140 chip from the other Matrix-12 to see if I can have this Matrix-12 completely working. If so, then I have to start sourcing a replacement - which seems to be quite difficult. Any hints appreciated. Thanks for the feedback on the heat of the ICs. They get somewhat hot, but I can touch them without getting burned, so it is probably OK. The power supply regulators also get somewhat hot, but the hearsinks seems to be able to handle it. Terje Winther terje.winther@... http://www.wintherstormer.no/

Hi, Does anyone know how the Xpander stores its settings? If you turn it on and off, it keeps the settings, for years and years. Is there a long-life battery? Thanks for any explanations! Cheers, Jeremy.

Hi Terje, These are analog switches which multiplex the master DAC voltages to provide individual sample and hold circuits for each parameter in a given voice. The resistor and capacitor networks provide a means of holding the CV voltage while the multiplexer moves to the next parameter. Analog switches are notorious for becoming leaky and failing, but if you have switched these out and the problem still exsists, then the problem is somewhare else. I see the Straps on the voice board schematic below the 6809 CPU It appears you will have to move these in order to " switch voice boards" That looks like the best aproach to isolate the problem to at least " which board is failing" These are older technology digital and anlog integrated circuits and they do tend to run on the warmer side. The CPU and memory chips are running at maximum speed so they will run hot. One thing to remember is if you place your finger on an IC you are adding heat to the circuit and if you hold it there long enough ( more than say 4 secs) the chip will heat up. Unless we are talking about power supply components (ie Voltage regulators), If they are burning your finger then yes, it's probably sourcing to much current to the next stage it is connected to. One common trouble shooting technique is to spray "Freeze spray" onto the chips one by one until the circuit works.It's an easy way to isolate a heat problem We can still get this in the US. But not sure about Europe. Usually obtained from an electronics supply house. Note: Don't spray this on the VCO/VCF chips because thses are temperature sensitive, and obviously it would change the tuning.

Hi all, Thanks a lot for all the help I have been given on this list. I have changed parts in the power supply, some CEM chips, all those el.caps who blocked tuning and sound, swapped some 74 series logic chips (so now all encoders works), and got new switches and rubber feet, and even a new key. And of course cleaned it up since all boards were out anyway. The Matrix-12 is almost all right now - it is just one peculiar error left: It seems that only one of the voice cards gets the proper commands. Voice 7 - 12 fails tuning of VCOs and VCFs, but all other tuning passes and there is sound from all 12 voices (if I turn them on) and the voices are almost in tune, and VCFs seems to work like they should. I also have another Matrix-12 in for service (yes, two M-12s in front of me - pretty sight!), and it too reportedly have an issue with only one of the voice cards working properly. I have double-checked the connectors (the paralell connector and the two 3-4 pin connectors) and they all seems to be fine. Any tips on what to do if one of the voice cards don?t responds? On another question: While having all the boards out, I noticed that there are very few manual trimmers on the M-12, but there are some, and I can?t seem to find any info on how to calibrate them. I have the service manual, and I find the trimmers there, so I can pretty much guess what to do, but it would be nice to know for sure. Terje Winther terje.winther@... http://www.wintherstormer.no/

Hello, A need a few answers : - What are the first informations displayed by the xpander on startup ? - On which display(s) ? - Immediately ? - after a few seconds ? Thank you ! Kris

I feel so dumb asking this question, but...I can't get my Matrix 12 to respond to MIDI input. I bought this synth recently and it's by no means the first. The MIDI output works fine. I've set up the zones, turned MIDI input on, etc, and still nothing. Has anyone else ever experienced this sort of problem? I also hooked up another keyboard and plugged the MIDI through from the Matrix 12 into the MIDI input on the other keyboard. When I sent MIDI to the Matrix 12, the next keyboard saw nothing. Strange. Any ideas? David

Hey folks i recently gave my synth a facelift and managed to remove all of the outer matt finish on my matirx-12 ( those cracks and flakes were becoming too annoying, and i just had to get to the shiny stuff beneath )... it looks amazing now! well i think so anyway.. a new lease of life.... anyway i was wondering if anyone would mind me uploading them to the board? not too sure if i have to go through the op first or just add them to the files section...? oh and no i didnt use any cleaning products, just a very slightly damp cloth and about 5 hours of work, very carefully teasing the coating off. anyway sure maybe get back to me and let me know what you think? about posting a few images that is... p.s. and im not taking any flack if something goes wrong if anybody else wishs to try cleaning up their M12 or Xpander... thats my disclaimer and i'm sticking to it... :) whether it was luck or attention to detail well i guess i'll never know, im just glad i tryed.. dc