Tom Oberheim SEM - glitching envelope?

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.
Post Reply
commodorejohn
Synth Explorer
Synth Explorer
Posts: 1591
Joined: Mon Aug 12, 2013 2:39 am
Real name: John
Gear: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, Oberheim SEM
Location: Sacramento, CA
Contact:

Tom Oberheim SEM - glitching envelope?

Post by commodorejohn » Thu Apr 27, 2017 8:24 am

So I picked up an Oberheim SEM reissue (patch-panel edition.) I'm driving it from my Korg ARP Odyssey with the CV/gate outputs on the Odyssey plugged into the VCO1/ENV1 CV/gate inputs on the SEM. This mostly works fine, but it has one rather odd issue: every so often, the envelopes will jump immediately to full sustain and stay there until released. I'm not entirely sure what triggers it; there doesn't seem to be an obvious pattern.

Is my SEM faulty? Is the Kodyssey feeding it something on the gate signal it doesn't like? Is this just a known quantity with the SEM? I'm really not sure what to make of it.
Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73

Post Reply