Dotcomformat

On Apr 16, 2008, at 7:02 PM, Alfonso Alba Cadena wrote:
> 1) How steep is the rolloff? I'm guessing it's 24db/octave.

yes. this is a 4-pole filter. 4-pole filters are normally associated  
with Moog, Sequential Circuits, and Roland keyboards.

it sounds more "moogey" than "prophetey" in the sense that it bears  
some resemblance to a Multimoog wearing a leather corset with robust  
boning. it's not quite as clinical as a Prophet filter but definitely  
a bit more risqué and aggro than a Norlin era Moog synthesizer, if  
you're asking for colourful observations about its tone.

> 2) What's the difference between the control inputs and the FM input?
> 3) Does the FM Amount knob only affects the FM input? If so, are the
> control inputs fixed to 1V/Octave?

the "FM Amount" knob is simply a control attenuator for the "FM  
Input." all inputs have one volt per octave response, including the  
additional 4 inputs on the as-yet-to-be-utilised "STG Bus" connector.

i really don't know why i named this control and input in this  
fashion, other than Paul Schreiber has a similar arrangement on his  
MOTM-490. all further filter modules will label the knob "Control  
Attenuator" as that is really more accurate.

> 4) I've read that the ARP 4072 filter (which the STG filter is NOT
> based on) only reaches 12 kHz. Does the PLF also has this limitation?

well it's definitely not a clone, but does happen to have like the  
same topology with the same transistors etc. i just don't like the  
"C" word: it's over-used.

one aspect of its uncloneliness is the fact that this factory defect  
of the 4072/4075 has been taken care of in this design. i can assure  
you that if i shipped this filter without calibrating it, you would  
find it only worked in the superaudio domain.

> Finally, would it be possible for someone to upload some mp3

a video-editor friend of mine will be in town for a month starting in  
early May, and we'll be working on video demos during that period. i  
probably should have some mp3 clips up too, but apparently i've been  
careless about this. my apologies.
---
Suit & Tie Guy
suitandtieguy.com
stgsoundlabs.com