[LAU] Octaver or fuzztone effect

[porl sheean]

pure data is something i have been wanting to look into. i suppose my reason
for the spice thing is that one of my hobbies is building and modifying old
valve amps (not a huge success rate at the moment though, but getting
there... stupid old power transformers dying on me...). i know that spice
will not give an accurate sound of a real valve, but it would be really
handy to hear *changes* with circuit modifications on a real signal. things
like frequency response are pretty straightforward i suppose, but what about
things like sag and the effects of negative feedback? bit harder to judge
from the schematic if you are a beginner like me :) i'll have to have a look
at your spice thingy when i get home (my machine here isn't set up for stuff
like that... yet :).

off topic (from my off topic previous post...): does anyone know where to
get *good* spice models for valves/tubes? especially working with oregano (i
tried geda but it keeps crashing on me). also good transformer models (i
know these can be done somehow with subcircuits, but as i said, i'm still a
beginner. i just want some basic 4k/8ohm single ended and push-pull models
for basic circuit building.

thanks
porl

On 29/05/07, Robin Gareus <robin at gareus.org> wrote:
>
> porl sheean wrote:
> >> Hmm. An interesting project might be hacking SPICE into being a
> >> kind of a deconvolution engine,
> >> to build a WAV impulse response file of a circuit. Then you could
> >> use that IR to "play" through the circuit using JACE or similar.
>
> > i have been dreaming of this for so long :) i thought about it the
> > other way though, using a 'custom' wave shape as a function generator
> > in spice itself. would be very slow this way though.
>
> I've been dreaming about a /jackifiying/ spice ;) - I spiced up my
> Pfingst Montag by added a libsndfile voltage-source to ng-spice. - For
> simple circuits it's not too far-off real-time performance: it takes
> about 4 seconds to simulate 1 second of foxxtone at 48ksps over here.
>
> Now it's Tueday and using a IR seems the way to go... simulating the
> foxx effect alone is not trivial. Based on the posted schematics, here's
> a preliminary http://mir.dnsalias.com/_media/wiki/foxx.oregano.gz - try
> yourself..
>
> > the good news about doing this though is that you don't have to
> > (unless you want to) emulate everything about the circuit, just the
> > signal path. this would simplify and speed up the calculations
> > somewhat.
>
> I've started to document the spice patch at
> http://mir.dnsalias.com/wiki/spicesound - the code's barely a few hours
> old and highly experimental. NTL, it's already allows to process spice3
> netlists reading and generating wav file(s).
>
> robin
>
> PS. pure-data is more fun than this!
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