[sdiy] MOTM 440 4P LPF questions

[Thomas White]

Discrete means to me that it is attempting to match the sound of the internal components of the CEM chip but with individual components. Aiming for the same sound without the chip. The enhance switch and vc resonance are the improvements for me. 

Thomas White
Natural Rhythm Music
www.naturalrhythmmusic.com

On Oct 30, 2011, at 4:03 AM, Dave Manley <dlmanley at sonic.net> wrote:

> On 10/30/2011 2:30 PM, David G Dixon wrote:
>> I saw and heard a MOTM 440 in action at the PNW synth meet (thanks, John
>> Rice, for letting me ruin your patch!), and I have a couple of questions
>> about it.  (It sounded wonderful, by the way, so if my questions are taken
>> as criticism, that is certainly not my intent.)
>> 
>> If these questions are impertinent, or if answering them would involve
>> giving away state secrets, then feel free to slap me down.  Otherwise, here
>> goes:
>> 
>> 1) Can anyone tell me which stage's output is being fed back for the
>> "Enhance" setting?
>> 
>> 2) This additional feedback is obviously at fixed gain.  What is it?
>> 
>> Here's a more philosophical question:
>> 
>> 3) Why should a "discrete OTA" give any better results than an IC-based OTA
>> or VCA?  After all, an IC is discrete on the inside.  (A direct comparison
>> of four different 4P filters, some discrete and some IC-based, on
>> Muffwiggler today would seem to debunk this whole "discrete" business, given
>> that they all sound identical, which suggests that this whole "discrete"
>> argument might just belong in the same category as the various gold-plated
>> audiophile claims we often laugh about here.  I'm just curious as to the
>> reasons why such circuits would or should be better.)
> 
> You could try asking Juergen Haible, IIRC he is the 440 designer.
> 
> -dave
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