OBERHEIM SYNTH

Looks like the pressure sensor connects to U17, which is probably a 556.with an ohmmeter you should be able to unplug it from the processor boardand measure the resistance as you press down on a key.   I think the pressure sensorsfail after a while on lots of keyboards from this era.   Shouldn't be too hard to 
replace.   You can adjust the resistor values around U17 if nec to get the desired action.
   Bob

      From: "hoggybogger@... [oberheim]" <oberheim@yahoogroups.com>
 To: oberheim@yahoogroups.com 
 Sent: Thursday, March 26, 2015 7:51 PM
 Subject: [oberheim] Matrix 6 Aftertouch
   
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I have a Matrix 6 and just realized my aftertouch is not working. I haven't opened this up to delve in to it just yet, I am wondering if anyone else has run in to this issue and had any luck repairing it? 
I didn't realize the Matrix 6 even had aftertouch until I connected a generic keyboard controller to the midi in and played some things. I couldn't believe the difference, amazing filter control and all sorts of neat things coming out of my Matrix 6 that I never knew were 'supposed' to be happening when I pressed the key down harder. 
If anyone has any tips on troubleshooting or repairing the aftertouch on a Matrix 6 I would appreciate it.
Thanks!