OBERHEIM'S FIRST SYNTH!

A look at the Oberheim Synthesizer Expander Module (1974) and Two Voice (1975), which were Oberheim's first two synthesizer products respectively. 0:00 Intro Jam 1:00 The Synthesizer Expander Module 2:04 Demo 1: State Sync 2:49 E-mu Systems 3:32 Demo 2: Two Voice 4:38 Dennis P Colin 5:49 Demo 3: Pull Seq Wonk 6:56 Jim Cooper 7:46 Demo 4: Transistor Bass Workout 9:04 Tom Oberheim 10:09 Demo 5: August Nineteen Seventy-Five 11:16 The Life Aquatic, Stranger Things and Drokk 13:50 Outro Jam Two Voice Listening: Life Aquatic - Mark Mothersbaugh: https://youtu.be/XTyZD0XFixs https://youtu.be/B1cZR7ezLiE https://youtu.be/qUBCmDgORYU Stranger Things Theme: https://youtu.be/pCfpTK0IB-w Drokk - Music Inspired by Mega City One: https://youtube.com/playlist?list=OLAK5uy_l-1p5dlmWorREOYL_1L4mdBwGX1PCLzoA Nerdy Details: Mini-Sequencer x2 two parallel sequences of 1-8 steps with CV set via the dual-concentric knobs. Independent assignment of sequence 1 to SEM 1 and sequence 2 to SEM 2 as well as sample and hold or keyboard control for either. Optional sequence transposition via keyboard. Sample and hold range and lag. Internal clock frequency, run and step control, plus clock frequency modulation from sequence 2 CV. Each SEM: VCOs: x2 Waves: Sawtooth or Pulse Tuning: Fine/Course Other: Phase sync Modulation: Frequency, Pulse Width, PWM Modulation Sources: Envelopes, LFO, Sample & Hold (EXT) Mixer: VCO waves EXT #1 Rear connection, although SEM 2 is normalled to SEM if nothing is connected, allowing for use of the SEMs in series EXT #2 White Noise from S&H circuit Filter: 2-pole multimode. Continuously variable low pass, notch, high pass, plus switched band pass. Control: Cutoff, Resonance, Mode Modulation: Bipolar cutoff modulation from envelope 2, S&H (EXT), LFO VCA: Controlled from Envelope 1 or drone (ON/EXT) Envelopes: x2 ADSD LFO: Triangle with frequency control Performance: Voice assignment - duophonic with left/right voice priority as well as unison. Per-voice portamento Master tuning and octave select. Output mixer: SEM 1 and 2 and master level. Signal overdrives beyond about 60%. Rear connections: These seem to vary from unit to unit and are usually modded. Furthermore, the original manual doesn't describe them, so I'm not actually sure what the "stock" rear connections are. On my unit I have CV/gate for each SEM, external signal in, external sequencer clock in and line out (mono).