From ksm@wavenet.com Sat May 31 07:13:17 1997 by hyperreal.com (8.8.5/8.8.5) with ESMTP id HAA24014 for ; Sat, 31 May 1997 07:13:17 -0700 (PDT) 31 May 97 10:08:58 -0500 27 May 97 13:02:24 -0500 Date: Tue, 27 May 1997 09:56:45 -0700 (PDT) From: ksm@wavenet.com (Keith Sterling) Subject: Re: Anyone here? X-MIME-Autoconverted: from quoted-printable to 8bit by hyperreal.com id HAA24014 >Hi Keith, >I´m very interested in modify my matrix12. I want to add sep outs and >inputs. >What mods do you have done? >tell us! > O.K., here goes: replaced oberheim's horrendous keyboard assembly, which belongs in the lowest Casio, with a Kurzweil K2000 keyboard assembly. Both units use the same encoding scheme so this was easy. I built a small pcb to adapt the K2000 assembly to the M-12 keyboard connector. The K2000 keyboard assembly was a second choice to a Roland but at $165 factory direct was much less expensive. Installed the guts of a Yamaha MCS-2 (I think thats what it was called) controller in the M-12. Oberheim never perfected their lever controllers. No matter how much I cleaned the pots the M-12 would spit out reams of PB=0,PB=1, PB=0, PB=1 data whenthe levers weren't being touched. This resulted in my midi sequences being padded with much useless data that then would clog the midi port and cause timing inconsistencies. The MCS-2 provides 2 wonderfully linear very clean wheels which I mounted in the LEVERS bay. As a bonus it supplies 4 pedal outs, which I routed to back panel 1/4 connectors. Of course the MIDI in and out were re-routed from the back panel of the M-12 through the MCS. Because the MCS board was mounted directly over the power supply unit I decided to add a fan. One of those 12 volt 3 inch units mounted directly under the cassette jacks. Because I use the M-12 in the studio as well as live I added a switch to run the fan slo (fan runs quiet at 7 volts) or fast (fan runs loud at 12 volts). When in slo mode the fan is barely audible but keeps the M-12 happily cool. The SPEED toggle switch is right beside the fan. Well, I have to go to work now but I will continue this story: Voice 6 has a Moog LPVCF Mem Protect button erases all memory giant multi connector on back replace many op-amps with Analog Devices chips much much more. The reason I have done these mods is to fully realize the vision that the guys at Oberheim had of their ultimate synthesizer. They got 90% of the way there. I've gone the last 10%. btw, if you want to add individual voices to your M-12 the connector is at the upper left hand corner of the voice board. You should be able to find out the wiring very easily with a probe and a set of headphones. Good Luck! Keith.