Roland PG-800 (1985)
Twenty-three sliders and a proprietary cable - the box that turned a menu-driven JX-8P into something you could play with your hands.
Overview
Twenty-three sliders, sixteen switches, three knobs and two buttons, in a slab measuring 265 by 215 by 27 millimeters. That is the whole physical argument of the Roland PG-800. Roland released the programmer in 1985 - the service notes carry a May 1985 date, and Syntaur's gallery gives the same year - as the dedicated external control surface for the JX-8P. The JX-8P's own panel relied on parameter/step editing to reach its parameters. The PG-800 let you grab a fader and hear the change.
The design is old-fashioned on purpose. Sources describe it as a traditional slider controller, an easy-to-use one in the words of the retail listings, not a menu system with a remote control attached. Roland's service documentation lists the "PG-800 CONTROL BOARD" among the parts, and the internal parts list shows slide potentiometers and rotary pots, push switches and a six-pin DIN socket. Nothing about the layout looks like a computer peripheral. It looks like a mixing desk shrunk to the size of a hardback book.
The PG-800 has no power supply. Spheremusic's listing is blunt about it - plug not required, no voltage, no power supply needed - and Equipboard's own FAQ asks the same question, which says something about how often the omission surprises people. The unit draws what it needs through the cable that connects it to the synth. That cable, per Equipboard, is a proprietary one, and it gives direct control over the sound parameters without any additional MIDI connection. The PG-800 is not a MIDI controller in the usual sense. It is an extension of the host instrument's own control circuitry, wired in through a dedicated port.
Compatibility goes beyond the JX-8P. Equipboard, Syntaur, Reverb and synth-db.com all agree the programmer was designed to work with the JX-8P, JX-10 and MKS-70, and the sales copy of the period and after treats it as the way to get complete control of all parameters on any of the three. One catalogue source also lists the MKS-80, and an eBay listing title adds the GR-77, but those two are single mentions and should be treated with caution. The core trio of JX-8P, JX-10 and MKS-70 is well corroborated.
Key Features
Twenty-Three Sliders, Sixteen Switches, Three Knobs, Two Buttons
The control count comes from an auction description quoted by Matrixsynth, and it is the most specific statement of the PG-800's layout in the record. Twenty-three faders is a lot of real estate on a panel this small. Every parameter that would otherwise require stepping through a numeric display gets its own physical control. The switches and knobs handle the ranges and modes the faders cannot, and the pair of buttons covers whatever remains. Owners describe the result as a godsend for live tweaking while running MIDI sequences - the phrase comes from that same auction text.
Proprietary Cable, No Power Supply
The PG-800 connects to its host through a dedicated cable rather than MIDI, and it takes its power from that same connection. Equipboard's description is the clearest: the programmer links to compatible synthesizers with a proprietary cable and provides direct parameter control without additional MIDI connections. Spheremusic confirms no external supply is needed. For anyone buying one today, that means the cable is not optional and not generic. A PG-800 without its cable is a parts unit until the right one turns up. The service notes list a six-pin DIN socket on the control board, which is where that cable lands.
The Faders Themselves
The slide potentiometers are 100KB parts, and the replacement market has kept them documented. Soundtoparts sells a fader described as having a 30mm travel distance with a 15mm lever, original Panasonic. The Roland service notes give the designation EWAKF8X15B15, 100KB, 15mm travel. Those two figures disagree on travel, and the archive has no way to settle whether one source is describing the lever and the other the track. What is not in dispute is that the faders are the wear item. Syntaur currently lists five replacement parts for the 1985 PG-800, and the fader is among them.
Slider Cover, Magnetic Sheet, Carrying Case
Roland's service notes name three accessories that shipped with the programmer: a slider cover, a magnetic sheet and a carrying case. Exposed faders on a tabletop unit get knocked, and a magnetic sheet is a cheap way to keep settings visible or protected between sessions. The case turns up repeatedly in the current market. Several of the eBay listings on this page include one, and a buyer's note quoted by Matrixsynth singles out the carrying case and cable as being in very good condition alongside the unit itself. Whether every PG-800 originally shipped with all three is not documented, so treat the accessories as period-correct rather than guaranteed.
Historical Context
Modern Recording (September 1985, p.50) listed the PG-800 at $295 in a Roland roundup, and the same item noted that JX-8P programming could be done either with the PG-800 or via parameter/step editing. Roland sold the synth with a working editing method built in, and sold the programmer as the faster, more tactile alternative. The price put it at roughly a fifth of the JX-8P's own $1,695 asking, which is not trivial money for an accessory.
The programmer got a second life through the rack modules. A Sound on Sound classified ad (November 1998, p.261) offered an MKS-70 and PG-800 as a pair. That makes sense, since the MKS-70 has no keyboard and even less panel real estate than the JX-8P, so the programmer was close to mandatory for anyone who wanted to edit rather than just recall. The same publication's January 1998 issue (p.269) carried a PG-800 on its own at £350. Thirteen years after release, the accessory was still trading at a meaningful fraction of what the synths it controlled were worth.
Collectibility & Market
Current eBay asking prices for the PG-800 alone run $650 for a unit with case and cable, $799 for one with case and manual, and $950 for a JX-8P/JX-10/Super JX example. A $1,598 listing bundles the programmer with a JX-8P synthesizer and is not a PG-800 price. Those asks sit well above the £350 the Sound on Sound classifieds wanted in 1998, though asking prices and sale prices are different animals and the archive has no confirmed transaction data. A Russian listing observed in the research priced a vintage unit in good condition at 201,190 ₽.
On buying, as far as the record supports any advice: check the cable first, because the PG-800 will not run without the proprietary connection and there is no MIDI fallback. The faders come second. They are the wear item, replacements exist through Syntaur and the parts trade, and a unit with scratchy or dead sliders is a repair project rather than a bargain. The archive found no documented failure modes or repair procedures beyond the parts availability, so a buyer is largely on their own diagnosing faults. Service and owner's manuals are downloadable through SynthXL.
eBay Listings
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