GP-10 Schematic anyone?

Started by philjynx, March 27, 2019, 10:40:47 AM

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Quote from: philjynx on March 27, 2019, 10:40:47 AM
Has anyone had any luck procuring a schematic for this? For the main PCB and of particular interest to me the switch PCB.Maybe a good quality picture of the switch PCB from both sides?
Fingers crossed.....

If you locate one - let us know
GP-10 Inside Pics


Don't feel bad, Moog doesn't want me to see the circuits for a vx352 cv in breakout box for the moog voyager Rme either.

Seem to be a simple circuit taking a 25 pin computer cord pin outs to the appropriate jacks with some attenuation doo dads here and there.

They don't make them any longer and difficult to find used. I asked moog if they wouldn't mind doing another small production run of those units,  but I haven't heard back.

But I like your idea of the photo of the circuit board. Already tried to find it as a PCB repair part.

Quote from:  philjynx on March 27, 2019, 12:08:28 PM
Even most of the pics in that thread have been redacted - seems GCHQ or NSA really don't want me to see what's inside these things....


Quote from:  philjynx on March 27, 2019, 12:08:28 PM
Even most of the pics in that thread have been redacted - seems GCHQ or NSA really don't want me to see what's inside these things....

Not sure what you mean  - they are all in the 1st post

and look like this

^^ reply if you can not see this pic ^^


See Also

Boss GP-10 DIY Mods

See Linz Henderson's Dual Rack GP-10

Linz Henderson wrote>

Yeah, I did the rackmounting myself. It started out as a 3D printed box containing the 2 GP-10s. I mounted that in a case along with my Alto mixer. The idea was to have a simple, lightweight rig for small Jazz and Blues gigs.

Apparently I never got around to taking pics of the finished thing, but this was the basic idea, photographed before it was all finished:

My bigger rig, which was my studio rack, was based around Ableton Live using S-Gear via my MOTU Ultralite and a USB to MIDI/SPDIF box for the Variax. I missed a lot of the features I was used to from the Roland systems I've used, so I then bought VG-99 number 4! However, I'd always had some issues with excess noise on the '99 and this one was no different. It also never quite lived up to the sounds I had in my head. I loved the dual paths and the MASSIVE sounds I could get with 2 x 12 string emulations, pitch shifted, open tuned (etc.) then split across different strings etc. I then (quite spontaneously) decided to buy a Helix Rack, and ended up with this setup:

After getting a bit fed up with the VG's form factor (and needing a bit of cash), I decided that I would be better off rack mounting my 2 GP-10s and selling the VG. The GP's models, although not quite as flexible as the 99's, seemed a little cleaner to me and I loved its USB MIDI out. Along with the Helix, it would be compact enough for small gigs, but also powerful enough for a more ambitious project. That's when I created the current version (the lower rack's redundant now - I just use it in the studio to raise the main rack up to a decent working height):

So, what are the benefits (to me)? Firstly, I'm able to carry it safely to any sized gig. The previous rack was a little awkward and it never quite felt solid enough. Most of my paid gigs are with my Blues band or various small Jazz bands. I wanted to have plenty of control, but didn't want to rely on any computer-based solutions for the simple gigs. The 2 GP-10s give me a nice level of control without having to rely on MIDI - not quite as much as the VG-99, but worth the trade-off in size. As well as the form-factor/size, there's a certain level of redundancy. I can go direct to the Helix with the Variax on battery power, use normal pickups, use either GP-10 with the GK, and I can bypass the Helix and go via the Mac Mini and S-Gear if there's an emergency. Of course, the ultimate goal is to use it all together, but it's nice to have options in case of emergencies.

I'm not using the Variax at the moment due to messing about with some mods and re-installing the Teensy (arduino) board and some switches. That means I'm relying entirely on the GP-10's modelling as I'm using my Patrick Eggle Berlin which only has the GK connected - no 'real' pickups hooked up just now. I've stuck with that for a couple of weeks now, because I'm getting far clearer, more 'stereotypical' Strat and Les Paul sounds out of the GP compared to the Variax. I didn't used to feel like that, but it's working nicely and a few people have noticed the extra clarity I'm getting, so I'm happy :-)

The 2 GP-10s are set to different patches according to the band I'm with. The left side one is currently the most used. I control the model with a 3-way toggle switch connected to GK S1 & S2, which gives me 4 separate sounds in one patch (via assigns), with no need for MIDI. It's set to change to:

Les Paul Bridge
Strat Neck

The Helix controls the CTL 3 & 4 jack, which I use for either Open G, or Open D tunings.

The right side is currently set up without any CTL switching (just GK) and is usually set to a Bass patch for some extra depth to certain tunes. In the Jazz bands, I always play bass, then switch to an L4 sound to take a solo, then back to bass. Switching on the GP-10 was never a problem at all, but now I just set each GP to the appropriate patch and use the Helix returns to switch between them.

For my own material, I love to experiment with BIG sounds, so that's one reason for using the Variax along with 2 GP-10s. I can split strings and feeds signals into the Helix or Mac Mini separately, and create huge sounds but still have total control over it all. The main benefit over the VG-99, for me (aside from the real-estate), is that I've got 3 guitar models which can be switched instantly, either individually or together. That's where the Mac Mini comes in. It's used for Ableton Live, but also deals with patch changes and MIDI control/routing. I use Plogue Bidule for my MIDI patch routing. I know I could do a lot of this with a Raspberry Pi, but the Mac's there running Ableton, so it might as well be doing the MIDI stuff, too.

The other purpose of the Mac Mini is for processing all of these signals out-with or alongside the Helix. Here's the other benefit of 2 GP-10s; I can play riffs with or without extra parts, but capture any part I choose using Ableton. This helps me get round what I see as the biggest problem with live looping - the length of time it takes to build parts. I can play an intro with chords and secretly record a bassline, tapped off from a GP-10, then introduce that on the next time round as I play some lead. I'll need to work a bit on my technique and make a video of that, as it's a bit tricky to explain exactly what I mean.

The MOTU Ultralite AVB is an amazing tool in all of this too. It's rock-solid and can be used stand-alone. For the Blues gigs, I control my own sound, the keyboardist's, and all the vocals. There's room for the bass and a couple of drum mics, too, but we don't really need to do that. I use a tiny little WiFI router, made by 'Vonets', to hook up my iPhone to the MOTU and mix everything during the gig.

On larger gigs (and what I plan to do when I start gigging my own material), I can run the iphone via the Vonets WiFi and control the Mac Mini without a screen. That also lets me connect a MacBook Pro to the MOTU's ethernet port, and I can simultaneously run audio from the Mini via USB. It's meant I can run quite complex soft synths for MIDI guitar, despite the fact that my Mini and the MBP are both relatively outdated 2012 models. Even better is the fact that my iPad can hook up to the Helix and receive all the MIDI data I'm generating for some great apps like Moog's Model 15 and Sunrizer! I also run a lot of MIDI as backing using Ableton's clips, which I can modify in realtime using expression pedals. For example, I'll run MIDI drum loops with some randomisation which I can then influence via expression, allowing me to add a lot of dynamics without the backing sounding like it's simply being turned up and down in volume.

It probably sounds like total overkill to some people, but the point is, it's a compact, reliable system that can scale up and down to suit almost any purpose. All the sound-generation is done via guitar, whether it be audio or MIDI, and I can set everything up in 20 minutes and take up very little space.

I'm sure I've forgotten loads of details, but I'm glad I could share my project with you :-)

Feel free to ask questions and I'll do my best to get back to everyone.

I'd just like to thank everyone involved in VGuitar Forums. You're a hugely knowledgable bunch and I've used the site as a resource for many years. It's nice to know there are many like-minded musicians out there who aren't scared to push the boundaries of music production and performance beyond the traditional methods!

Cheers guys!


Found one here:

file too big to attach - maybe one of the admins can sticky it in the appropriate place.