So you have the incredible Dave Smith / Tom Oberheim OB-6 synthesizer, but you are having trouble keeping track of patch storage. You don’t want to overwrite your favourite factory patches, but it’s hard to remember what’s stored where!
There is a patch list on the Sequential site, but it is only available as a PDF. You might want to open it in a spreadsheet so you can manipulate / edit it, so here it is as a text file, which can easily be imported into almost any word processor or spreadsheet app. (Due to the stucture of the PDF on Sequential’s site I found it impossible to extract the text efficiently, so I manually re-typed the entire thing.)
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 (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 (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.
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). 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.