[sdiy] Modeling circuits

[Tom Wiltshire]

My bet;

A grudging "well, it's really pretty good..." with an unsurprising "...but it's still not quite as good as a genuine tube Bassman (insert favourite amp here)".

Of course, they won't be able to tell you in any concrete way *what* isn't as good.

Like you, I'm interested to see how it turns out.

T.

On 23 Oct 2010, at 13:37, Dave Kendall wrote:

> FWIW, the digidesign eleven rack http://www.avid.com/us/products/eleven-rack has different input impedances for whichever pedal or amp model is first in the chain. I believe 4 different impedances can be selected using digitally-controlled resistors. Sounds interesting - a guitarist friend has bought one, and 2 of his (purist tendency) friends are trying it out.
> 
> Will be interested to see how it turns out.....
> 
> cheers,
> Dave
> 
> On Oct 23, 2010, at 09:35, cheater cheater wrote:
> 
>> <semantics>
>> Scott, I think you're not actually talking about component level
>> modeling, just about "physical modeling" of circuits. or
>> component-based modeling, I.e. you take a circuit (or large block) and
>> find the (differential) equations that describe its behavior as a
>> whole and then you run that using newton-raphson or something like
>> that. I think component-level modeling would mean having separate
>> equations for every component, including separate sources of
>> self-noise, separate thermal characteristics, and possibly separate
>> device features as well (because of tolerances). I think this is what
>> Jason has touched upon in his email. Semantics, but I think it
>> explains :-)
>> </semantics>
>> 
>> Cheers,
>> D.
>> 
>> On 23/10/2010, Jason Proctor <jason at redfish.net> wrote:
>>> really? do you have a source for this information?
>>> 
>>> i ask because of a post by Paul Schreiber a little while back which
>>> describes how component level modelling isn't viable with current
>>> processor technology.
>>> 
>>> the interview with UAD in Tape Op also didn't mention this -- IIRC, that
>>> is...
>>> 
>>> 
>>> 
>>>> State of the art modeling such as Universal Audio uses, and probably
>>>> line6, actually painstakingly models the electrical behavior of
>>>> every circuit element (transistors resistors, tubes etc) on the
>>>> original circuit board and runs that model on one or more dsp chips,
>>>> which is why they need a lot of horsepower.
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>> On Oct 22, 2010, at 8:21 AM, "Barry Klein" <barryklein at cox.net> wrote:
>>>> 
>>>>> Hi,
>>>>> Just received an ad from Line6 on their "HD modeling" pedals.
>>>>> Made me wonder...  What if you had one that took your crappy old
>>>>> sawtooth and made it
>>>>> a nice fat/phat Moog one....  you get the idea.  Do these types of
>>>>> circuits apply different amounts
>>>>> and/or frequency eq based on the input character or are they fixed
>>>>> and you get what you get?
>>>>> 
>>>>> Barry
>>>>> 
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