I'm glad to see this thread sparked some discussion. Being as the "kitchen sink" sentiments have come up:
I actually discussed the "what were you thinking?" aspects of the sig Fly with Adrian, in person, several years ago, following his surprise appearance at the Digitech/Harman room at the 2013 winter NAMM. The short version is that the brainstorming got a little out-of-hand, then had to be reined in with the final product and DF842AB (which I've also seen listed as "ABDF842").
Here's a longer version:
After having come around to the realization that he disliked putting the Fly down to play his customized Stratocasters, Adrian reached out to John Page at Parker about getting a custom Fly built with his preferred Strat mods (Sustainiac and GK-2A/13 pin-out). Parker Artist Relations (John Vitale, I think?) replied that they'd love to make it the brand's first signature model. This led to Adrian (at the time also in love with the promise of the newly-released Line 6 Variax) asking if all three circuits could somehow be implemented into the typical Parker magnetic/piezo system.
I'm going to forego the bulk of the proper R&D history and instead focus on the narrowest aspects of how form dictated function: Due to the space constraints and "cluttered" look of the switch and knob-covered Mojo MIDI, an aesthetically clean, streamlined implementation (with those great automotive finishes) was decided upon as an eye-friendly alternative:
- Adrian personally didn't use the guitar-mounted pot or switches in the Roland GK kits (instead controlling each branching signal path of his rig with Roland volume pedals); so they were omitted. Forgoing the hex pickup in favor of utilizing the Fly's distinctive piezo bridge in feeding the Variax and 13 pin board was another purely-cosmetic consideration (For the unfamiliar: hexaphonic piezo setups necessarily exhibit crosstalk artifacts, versus the generally preferred and relatively stable performance of potted magnetic pickups such as the Roland GK and Fishman TriplePlay).
The choice to go all-in on the piezos ultimately led to RMC's elements and PolyDrive board being chosen over Fishman, following Adrian being advised that RMC had the least-troublesome crosstalk issues of the brands available at the time. An even greater reason was to do with the PolyDrive board pulling MVP duties with incorporating the combination of active and passive pickups, putting them in parallel with the EQ'd piezo signal, and separately bringing the piezo signals up to snuff in driving both the Variax circuitry and the outboard 13-pin synthesizer.
When I brought up Graphtech's Hexpander tech (which, by 2013, was clearly in line to be adopted as the go-to piezo and 13-pin tech for Parker, and had coincidentally just been adopted by the newly Yamaha-purchased Line 6 for use in the JTV-89F), Adrian was unacquainted with the product. Sadly, we'll never know if or how subsequent Belew model revisions might have incorporated the Ghost system.
Something I never see noted is that, as of 2003, Roland synthesizers (which Adrian has used from 1979 to the present) began utilizing the previously-unused pin #9 in the cable to transmit mag/mix/synth selection commands. Had this functionality been implemented (rather than conspicuously omitted), the Variax component would have required either an additional cable or battery for power. In fact, the proprietary breakout-box required for the guitar to work as intended necessarily outputs a
12-pin signal, for this reason.
- The software component of editing Variax sounds and tunings hadn't been released when Adrian was first sold on the tech; so the Variax RJ45 interface was omitted in lieu of the option of a TRS-carried external power source (required to isolate it from the Sustainiac's onboard 9-volt battery and the typical outboard-powered RMC hex board). In order to limit the amount of required cables connecting the guitar to outboard gear, a proprietary 13-pin-to-12-pin +8VDC power supply brick adapted from the Line 6 T/R/S version available at that time, transmitting power via the typically unused pin #9, was settled upon. This means that the guitar's Variax component only functions when two 13 pin cables and the powered breakout box are used in conjunction with a 13 pin-receiving device with an option to output the "direct"/magnetic guitar signal transmitted... but which
doesn't depend upon pin #9 to do so. I didn't bother reviewing this bit of trivia with Adrian, as he'd glossed over the matter with "Axel found the ways to make it all work - The Parker guys just said 'You'll need these, too'."
As stated in a previous post, Dennis Anesi confirmed that the RJ45 connector was the only component required to restore full editing functionality to the guitar's Variax 1.0 tech. Furthermore, a dual-gang magnetic/Variax approach to the pots and selector switch (which would become standard in subsequent Variax iterations) was chosen, to minimize redundant or circuit-specific controls (such as the Variax on/off/bank knob). This meant that the Fly's magnetic and piezo pickup controls were necessarily constrained to the Variax 1.0 functionality of Master Volume, Master Tone, and 5-way pickup selection. As a consequence, the magnetic/piezo circuit sounds are limited to what Adrian deemed the five essential Fly sounds he sought to retain:
1. Sustainiac functioning as active neck single coil
2. neck+piezo RMC Polydrive preamp mono-output (with balance between the two only able to be affected via internal trim-pots)
3. piezo solo (interesting to note that the only way to hear the mono-output of the RMC PolyDrive's non-"13 pin waveform-optimized" EQ functionality on its own requires no fewer than two cables and a guitar synthesizer, in addition to switch position 3).
4. Dimarzio bridge humbucker+piezo
5. Passive Dimarzio humbucker on its own, buffered by the Sustainiac and PolyDrive (note that the pickup is wired directly to the 1/4" “courtesy” output jack, and jumpered from there to the input of the RMC PolyDrive preamp - This is because the combined humbucker+piezo selector switch setting requires each signal signal to be buffered and sent to the 10k and 50k pot requirements of both the Variax and RMC “cool circuit” signal routing).
I always found it fascinating that the guitar has an output jack that essentially only exists to be used in the event that either every active component of the guitar fails, or that one has only a 1/4" cable and amp for equipment (in which the guitar volume cannot be affected, except by turning down the amp).
All this extra R&D, due to wanting the Variax included! And that's without even touching on the logistics of Parker and Line 6 arriving at such an arrangement (Adrian putting it succinctly: "I asked Line 6, and they said 'Sure'").
- Adrian only engages the Sustainiac in an on/off capacity; at full "intensity." Hence, a single push/pull tone pot for engaging the Sustainer, combined with an ingenious end-of-travel detent to engage the octave-up mode, eliminated an additional switch or two from the face of the guitar. A 9-volt battery and on/off switch on the backplate were elegant ways of isolating the Sustainiac circuitry and minimizing the chance of squeals and other issues one risks encountering when running separate active circuits in the same guitar (something I've had first-hand experience contending with).
So when the guitar, for all its R&D hurdles, was finally and officially debuted as a purchasable product at the '09 winter NAMM... to say that it was a hard sell was an understatement: In addition to the lack of ease-of-use, mandatory outboard gear (of which only the proprietary component was included), and costing as much as 8 or 10 used Flys, Line 6 had already failed in marketing the original Variax line in the years between pitch and production of the Belew Fly; making its inclusion a source of puzzlement for many, rather than excitement. This was addressed when Parker attempted to course-correct the brand with the Dragon/MaXXFly:
The DF842AB was the bulk of Fly-related conversation I had with Adrian, that day: The takeaway was that he didn't seem to care for it. By this time, the original Belew model had been quietly discontinued. This replacement - flagship of the new line and shape - dropped the Variax integration while, for whatever reason, retaining the control scheme mandated by the Variax: Three knobs and a blade pickup selector switch. The Variax on/off/bank knob had been replaced with a mag/mix/piezo
blend pot with center detent (rather than the on/off/on toggle used on every other model), and the 5 way blade switch utilizing the piezo in positions 2, 3, and 4 was replaced with a 3 way mag selector switch (because the piezo switching options were now relegated to the blend pot). The guitar also had
fewer onboard switching options than the mainline Fly or DF842; due to the volume pot functioning as a dual gang master for the mag circuit and PolyDrive preamp. Ostensibly, owners were expected to feather piezo signal in and out with the blend pot (In fairness, knowing that Adrian uses his Roland VG-99's acoustic simulation, rather than the guitar's onboard piezo tones, helps to explain things).
In short, my opinion remains that the 842 Belew's control scheme manages to be the worst of all options, seemingly for no reason other than retaining the aesthetic of three knobs and a blade switch.
Another curiosity was the guitar now requiring
two 9-volt batteries (Perhaps because the proprietary junction box to power the Variax circuitry was no longer included with the guitar?), and the guitar retaining the same 1/4" "courtesy jack" wiring (in order to avoid the MIDIFly issue of the piezo preamp not outputting in stereo, I suppose?). Though I was polite enough to not grill Adrian concerning what in the hell the point of such a switching scheme was, I couldn't resist asking about the removal of the Variax functionality. He responded to several questions with one statement: "At the time, I wanted the Variax in the guitar because it was state-of-the-art; and I really wanted people to feel they had access to everything when they had that guitar. But I ended up never really using it, and I just play one of the new [JTV line] Variaxes when I want those sounds."
I also teased him somewhat by pointing out that I hadn't seen him leave his main Arctic Silver Fly at home, in favor of touring the "new and improved" model - To which he just laughed, raised the Parker gigbag containing his prized #1 (kept on his back or at his side at all times following his demo of the Impossible Pedal a few minutes before), and replied "Parker already built me the perfect guitar. I
do have a few new ones in a fretless version, that I'll be touring with Nine Inch Nails, though [His role in the tour sadly never came to fruition]."
I've attached a crude drawing of the 13 pin mapping for the Belew, along with a
link to Elantric on vguitarforums explaining pin #9 in normal use.