hi guys, wondering if you may be able to help.
upon further research into am M-board VCF envelope issue both myself and scott are sharing, i found that the problem is the once the envelope opens, it NEVER closes. i realized that when first powered up, the problem voice card envelope opens properly. it just stays open. so when the voice rotation comes back to it, its still open, hence it sounding like the sustain level is set to an astronomical amount. more specs:
-almost definitely not IG00152. tried with new working chip, and same problem.
-almost definitely not VR 15,18, or 19. replaced VR18(sustain level), and checked impedance of VR 15 and 19. both working.
this leads me to believe that there is failure of another part on the m-board. does anyone know these well enough to take an educated guess here? thanks guys!
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[Non-text portions of this message have been removed]
upon further research into am M-board VCF envelope issue both myself and scott are sharing, i found that the problem is the once the envelope opens, it NEVER closes. i realized that when first powered up, the problem voice card envelope opens properly. it just stays open. so when the voice rotation comes back to it, its still open, hence it sounding like the sustain level is set to an astronomical amount. more specs:
-almost definitely not IG00152. tried with new working chip, and same problem.
-almost definitely not VR 15,18, or 19. replaced VR18(sustain level), and checked impedance of VR 15 and 19. both working.
this leads me to believe that there is failure of another part on the m-board. does anyone know these well enough to take an educated guess here? thanks guys!
---------------------------------
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[Non-text portions of this message have been removed]