Subject: Re: [linux-audio-dev] New plugins, fixes etc.
From: Erik de Castro Lopo (erikd_AT_mega-nerd.com)
Date: Tue Jan 15 2002 - 09:15:55 EET
On Mon, 14 Jan 2002 23:43:18 +0000
Steve Harris <S.W.Harris_AT_ecs.soton.ac.uk> wrote:
> http://plugin.org.uk/releases/0.2.3/
>
> * Spellunk fixes (thanks to Frank Neumann)
> * Almost all plugins now have working activate methods, so they won't have
> spillover if you stop and restart them (on propertly wrtten hosts)
> * Added crossover distortion
> * Added tube rectifier simulation
>
> The additions mean that it should be possible to simulate a tube (valve)
> amp (but not cabinet yet) with a chain of:
>
> tube (or harmonic gen) -> tube rectifier -> crossover dist -> EQ
I have never seen a real tube guitar amplifier with a crossover so the
crossover should probably be ditched. Because guitar amps usually have
10, 12 or 15 inch speakers (from 1 up to 8) and rather large cabinets the
correct EQ should probably be a high order (8 to 12) butterworth lowpass
at somewhere between 4Khz and 10kHz to accurately model the frequency
response of the speakers and cabinet.
> I haven't forgotten about the compressor, I just haven't worked up the
> energy to tackle it yet.
I have a rough hack of a compressor (but nice sounding) I'm getting ready
for a tutorial I'm presenting at Linux.conf.au in a couple of weeks. I
should probably downlaod the LADSPA stuff and see if I can create a plugin.
My compressor currently has:
- switchable feed-forward / feed-back architecture
- attack time
- hold time
- release time
The attack and release timers currently do exponential ramps, but I should
also look into doing linear ones.
Cheers,
Erik
-- +-----------------------------------------------------------+ Erik de Castro Lopo nospam_AT_mega-nerd.com (Yes it's valid) +-----------------------------------------------------------+ Linux: Because rebooting is for adding new hardware
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