More Synth Maintenance Completed

It’s been a busy week behind the scenes at Studio Nebula. Not a lot of creative stuff going on at the moment, but I’ve taken the time to give much-needed TLC to some vintage gear.

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Sequential Multi-Trak (Hi Res Photos)

A photographic exploration

…of my new Sequential Multi-Trak. Planned work:

  1. Replace the battery
  2. Install the new Tauntek/Bob Grieb firmware
  3. Perform battery drain / current draw mod (if necessary)
  4. Replace buttons which have yellowed over time
  5. Replace foam in the flight case

View The Gallery, and Some Links

An Observation: Synths With Revised Filters.

Some of the world’s most respected, coveted synthesizers went through production revisions that audibly impacted the instruments’ sonic character. Here are four such synths that come to mind:

  • Korg MS-20
    Korg MS-20 (from Synthgear.com)(to quote Korg’s MS-20 Kit press release: The original MS-20 used different VCF circuits depending on the date of production. Units produced in the earlier period used a filter noted for its distinctive distortion and self-oscillation, while the filter used in later units was a low-noise design with a more mellow character.) The earlier filter is known as the “Korg 35″, while the later revision is a more conventional OTA-based filter.
  • ARP Odyssey
    ARP Odyssey (from Matrixsynth)(The Odyssey is notorious for bearing three different filters in its lifetime. The first Odysseys shipped with a Moog-style ladder filter. ARP was threatened with legal action so they quickly replaced it with a buzzy 2-pole filter, which was quickly replaced by a unique, aggressive sounding 4-pole filter.
  • Sequential Prophet-5 (rev. 2)Sequential Prophet-5
    Rev. 1 and Rev. 2 Prophet 5s used SSM ICs for their VCOs and VCFs, while the Rev. 3 Prophet 5 used CEM ICs. Some say the Rev. 3 Prophet 5 sounds weaker as a result.
  • Roland MKS-80 Super Jupiter
    The infamous Supe Jupe rack’s filter had an agressive, high-resonance character (IR3109, same filter as the Jupiter-6).MKS-80 Super Jupiter with MPG-80 Programmer But Rev. 5 units (serial number 511800 and up) used Roland’s new IR3R05, the same silky smooth filter that would find its way into the JX-8P, Super JX, and MKS-70.