linuxaudio.org

2011/2/27 Giuseppe Zompatori :

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> 2011/2/27 Stefano D'Angelo :

>>

>>

>> Ciao Giuseppe,

>

> Ciao Stefano,

>

>>

>> In the FAQ they say it's actually some sort of preamp... but well, I

>> can't provide hardware anyway.

>

> I was merely pointing it out as I don't think there is currently any

> other way to do it.

> Connecting the guitar directly to the phone with a simple plug adapter

> would probably sound meh.

> Unless Google wants to add support for external USB sound cards to Android? ;)

Oh well. :-)
>> I don't even know if I would charge for such plug-ins and/or release

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>> them as closed source. Ideally, I would release them under GPL and

>> accept donations, but have no idea really. Actually there are a couple

>> of plug-ins I could really charge for since they are really beyond

>> state of the art and suitable for scientific publications (indeed,

>> that's why I'm developing them). They are physics-based simulators: a

>> fully parametric tube amp + eq + output transformer + loudspeaker +

>> air impedance, and a couple of diode clippers (one is

>> tubescreamer-like) - still some pieces are missing at the moment (new

>> triode model in the making, oversampling not yet in place, opamp model

>> not yet serious).

>>

>

> Sounds cool, I recently bought one of those beasts (

> http://www.fractalaudio.com/products-fa-axefx.html ), and I think it's

> amazing, hands down the best amp modeling I've ever heard (and amazing

> effects too!) demos are here

> http://www.fractalaudio.com/experience.html

>

> It also does model the power stage section (power tubes->output

> transformer<->cabinet interaction) and exposes many parameters to the

> user, like tubes bias, negative feedback amount (if any), sag, B+

> filtering/capacitance, even speaker distortion etc.

> I'd be happy to compare your plug-ins to the Axe-FX ;)

Well... they seem to have a lot of stuff there. :-)
However, I wonder how they do it... I think they are probably using

some black box modeling, since multiple nonlinearities+feedback in a

single system is very hard to model.
The kind of stuff I'm trying to do is accurately model a class A amp

with a single triode using white box techniques... to give you an idea

of what it sounds like see this:

http://www.youtube.com/watch?v=cdNtmaIdLdo - it is part of my MSc

thesis presentation (100.000 lire guitar, dated and slow laptop, cheap

speaker and cheap camera... only the sound card is good).
I guess you speak Italian (at least your name suggests that), so enjoy

my weird southern accent. :-P
> I would personally prefer desktop LV2 versions of your plug-ins, they

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> could always be ported later to Android if it's going to be worth the

> effort.

Sure, that would be the path to follow.
> And I would prefer GPL'ed plug-ins and be willing to donate, I don't

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> think there are many options right now on Linux, I dislike rakarrack

> and guitar_ix, and find CAPS* so so.

Well, they say guitarix has improved, yet the last time I was all but

satisfied with it. You may want to take a look at invada plugins, if

you haven't already.
>> However, correct me if I am wrong, I don't think most Android

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>> platforms would be suitable for live processing (latency), but only

>> for recording (what about quality?).

>

> Can't help you there, sorry. I have a cheap entry level HTC Tattoo and

> it's slow as molasses. Haven't even attempted to install any audio

> related apps. It might be feasible on higher end droid phones though

> provided the audio API allows it, I just don't know. I think there has

> been a recent discussion about realtime audio apps on Android on LAU

> if I am not mistaken, you might want to search for it.

Ok, thanks.
Stammi bene,
Stefano

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