Subject: Re: [linux-audio-dev] [ann] unmatched - a LADSPA amp tone
From: Lea Anthony (stonekeeper_AT_stonekeeper.freeserve.co.uk)
Date: Thu Oct 24 2002 - 02:13:43 EEST
Have you guys heard amplitube? Man, those sounds rock!
-Lea.
On Wed, 2002-10-23 at 20:06, Steve Harris wrote:
> On Wed, Oct 23, 2002 at 02:37:17 +0200, Tim Goetze wrote:
> > still i'm not convinced that a sine should only be compressed
> > if < 0 by valve_1209.so.
>
> Well, the valve plugin is an aproximation of a single valve, a guitar amp
> has several if I understand correctly.
>
> To make distortion I generally use a softish valve followed by some stuff,
> followed by an inverter (to make the DC offset smaller), followed by some
> stuff, followed by a harder valve. That will give something roughly like
> the scope shot Paul posted after this.
>
> Stacking the valve plugins is the key to making them sound interesting.
> As I have said before, if someone comes up with a chain of effects that
> sounds even vaguely like a guitar amp I will combine it into one plugin.
> That should be easier to use and faster.
>
> I dont think the sign of the signal will effect the sound of the output,
> just the appearance. Remember the DC offset and the phase shift. The
> valve plugin has none, I would expect a real valve to have a fair bit. It
> shouldn't noticably effect the sound though.
>
> > i've copied (950 + 50 silent) samples of each into
> > http://quitte.de/fender-sine.wave -- the quitte.de quota is
>
> Cheers. Just looked at it. It was what I was expecting from your
> description.
>
> > >Infact, this should just happen, if you use the crossover plugin and
> > >put the output through your speaker cone IIR you should see a similar
>
> > yup, it definitely looks more like it on the scope. but the
> > aliasing the crossover introduces is simply unbearable. i think
> > i'll go for a ride and show some waves to the guy who fixed my
> > fender amp recently, he knows a lot about the circuitry.
>
> The crossover plugin was a shot in the dark, based on a vague description
> of the effect by someone who understood the electronics. Now I have seen
> your recording, and have applied some brain power to it it's obvious what
> I did wrong, and how to fix it.
>
> - Steve
>
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