Re: [Guitarix-developer] question about gxpreamp LV2 (and also tubescreamer)

[hermann m. <bru...@we...>]

Am 14.08.2013 19:02, schrieb Andreas Degert:
> 2013/8/14 Harvey Lord <har...@gm... <mailto:har...@gm...>>
>
>     just to interrupt a second here, what and where are these "Best
>     Plugins"? Are they the set of cab IRs that's been in since I did
>     the sample recording of guitarix for brummer a few years back?
>
>
> No, its IR's made by David, there is a link on the Guitarix front page 
> (http://guitarix.sourceforge.net/ , click on bestplugins). They are 
> not specifically for Guitarix, and in fact there is a little impedance 
> mismatch in naming (plugins are something else in Guitarix) and the 
> effect units used as a base chain (Windows VST units, we have similar 
> but not exactly the same in Guitarix).
>
> Btw the cab IR's are great, how did you make them?
>
> cheers
> Andreas
>

Hi
Sorry for join the discussion late, but I'm just come home . . .

The cab IR's wasn't made by Harvey, I've clipped and EQ'd them from some 
free IR's I've found in the net. Harvey have provided the sound example 
we have on the project page.

Harvey, when you open the guitarix convolver setup widget file browser, 
you will see 2 new folders in the top left frame. They are "amps" and 
"bands". This folders contain the IR files from "BestPlugins".

"BestPlugins" is just the name David have chosen for his work, like we 
have chose "guitarix". :-)

>
>
>     On Tue, Aug 13, 2013 at 2:46 PM, Andreas Degert
>     <and...@go...
>     <mailto:and...@go...>> wrote:
>
>
>
>
>         2013/8/13 SxDx <se...@fr... <mailto:se...@fr...>>
>
>             On 08/12/2013 11:47 PM, Andreas Degert wrote:
>
>                 2013/8/11 SxDx<se...@fr... <mailto:se...@fr...>>
>
>                     Hi,
>
>                     why is gxpreamp.lv2 disabled in src/LV2/wscript ?
>                     Is it bugged? Is there another lv2 plugin doing
>                     its job?
>                     (I see a gx_studiopre.lv2).
>
>
>                 don't know, I hope Hermann can comment
>

Yes, the gxpreamp.lv2 simply isn't finished, it's provided by Steve, but 
he never finished it, so I disabled it for build. gx_studiopre.lv2 is as 
well from Steve, he have work it out after gxpreamp, it is finished and 
do the job well. So I didn't know if Steve plan to finish the former 
gxpreamp.


>                 For tubescreamer, it's the simulation of the pedal with
>
>                     same name?
>
>
>                 yes (if you need more specific info, please ask :)
>
>                 cheers
>                 Andreas
>
>
>             Hi Andreas,
>
>             to be honest, I am trying to use some IR to reproduce
>             sounds of some well know bands (see eg.
>             http://www.youtube.com/watch?v=_I7YKOFmc6M). On that video
>             the kid uses a preamp
>             simulation. Another guy
>             (http://www.youtube.com/watch?v=fe5rX5oOV4s)
>             uses some kind of tube screamer followed by a preamp.
>             (Both guys
>             follow that with a convolution engine, obviously.)
>
>
>         The other guy is David Fau Casquel, his "Best Plugins" are
>         bundled with the latest Guitarix version of Guitarix. David
>         has also made some videos where he explains how he produces
>         the IR files. Normally, if you want to reproduce some guitar
>         sound this way, you would start with a sequence of that sound
>         and your recorded guitar, then add the distortion part to it
>         and then produce a filter (the IR file) that matches the
>         spectrum of your sound to the original one.
>
>         Taking the IR file and chaining it with other effect units
>         than the original ones (that were used for the "distortion
>         part") will of course not yield the same result. We had a
>         little discussion about it on the Guitarix forum
>         (http://guitarix.sourceforge.net/forum/viewtopic.php?f=3&t=4494),
>         and I'm still waiting for someone to produce the sound files
>         which are needed to start some experimenting.
>
>             I want to mimic this setup using guitarix parts (in LV2).
>
>             So far, using tube screamer followed by gx_studiopre.lv2
>             and then
>             a program called "IR LV2" (a frontend to zita-convolver)
>             to do the
>             convolution gives reasonnable results.
>
>             I tried to use gx_amp.lv2 directly but there is the
>             cabinet simulation
>             in there, which should be bypassed, no? When I set
>             "cabinet" to
>             minimum in gx_amp.lv2 I expect no change in tone when changing
>             the cabinet model (let's say from 4x12 to Marshall) but that's
>             not the case, the tone changes.
>
>
>         I haven't looked into the lv2 modules, but the Guitarix
>         cabinet (as an effect unit in the Guitarix program) has only a
>         volume and additional filter controls. Normally a "cabinet
>         effect" wouldn't have a wet/dry control, but just on/bypass.
>         If the IR file is produced without a "cabinet" in the chain,
>         it's sound part gets already "included" into the IR.
>

In the latest release, you can select "Off" for the cabinet and the 
tonestack, I've included that special for this purpose.

>             I will try with guitarix (not in LV2) to see what I can
>             achieve.
>             When I listen to this guy: http://soundcloud.com/gaiusbaltar
>             I think that "Guitarix + Mark V IR file" sounds better than
>             "Guitarix LV2 + BestPlugins Mark V Impulse Response" (you will
>             need flash to listen). Is the difference due to the cabinet or
>             something else?
>
>
>         I'd say it's just different sound effects in front of the
>         convolver. You could pull up both setups, and the compare the
>         sounds with convolver off (or on).
>
>             When we look at the screenshot (click the little
>             image near the title) of "Guitarix + Mark V IR file" we
>             see the
>             following setup:
>             - noise gate
>             - tube screamer
>             - amp (no cabinet in there as far as I can see)
>
>
>         "bass boost" and the "presence" are also activated. "presence"
>         is also IR based (it a sort of cabinet) and changes the sound
>         a lot.
>
>             - convolver
>             That setup cannot be done with LV2 stuff, can it?
>             (forget the convolver, I have IR LV2 for that)
>
>
>         I think the ts9 simulation is packaged as LV2, but I'm not
>         sure what the options for the amp are. Hermann did the LV2
>         plugins, and I haven't really looked into that.
>

The amps in GxAmplifier.lv2 are the same then those in guitarix main, 
including the presence. Just the bass-boost and the reverb isn't 
integrated. But, they are both separate modules in guitarix main anyway, 
even if the UI suggest they are part of the amp. In the lv2 ports you 
could find the bass-boost in the gxbooster.lv2  plug. the reverb I 
haven't ported (still I never use it, and my impression is that "nobody" 
use it). :-)
The difference is that I've integrated the tonestack and cabinet in the 
LV2 amps (Ui), but you can select "Off" now for this, so you get the 
same then the plain guitarix amp module.


>             Okay, if you have no time guys, that's fine. In the end, I
>             will
>             probably go back to looking for my sound without using an IR
>             (I look for MY sound after all). I was just curious to see
>             if I
>             could do what those kids do using guitarix with my debian
>             based
>             computer.
>
>
>         As said in the referenced forum discussion, if you can come up
>         with a (short) sound track of some original sound and a cover
>         track (just roughly the same notes, as a dry guitar
>         recording), we can find out if we can produce the matching IR
>         (+ distortion units and settings). If you are interested you
>         can also just send private mail.
>
>         cheers
>         Andreas
>
>