MOTM

> Next filter
>
> Will come out in late October. Is Haible Jurgen's SSM2040 clone with
> 'enhancements'. Will be 4-pole LPF, very
> Moogish (in fact Moog sued them, and they then made the SSM2044). It is
> *very* similar to a Moog ladder: some
> folks swear it sounds better (a la Prophet 5 Rev 2's). Uses like 10 dual
> pairs: expensive but will really minimize
> CV bleedthrough which muddies up the sound (and why VC Q does the same,
> unless you cheat like OnChip!).

Paul,

Whatcha thinkin' about in terms of a panel layout for the SSM filter? Same
as the 420 but without the switch? Got a model number so I can twiddle
pixels?

What 'enhancements' are you thinking of? I would ask for input overload
capability as in the 420.

Folks, I'm pumped about this filter! I was going to build one myself until
Paul told me he had it already in the works. If you are not familiar with
it, it is a yummy sounding filter used in the very early Prophet 5, and some
other famous synths as well (see Paul's website CEM section for a list). It
blows away the Curtis chip filters used in later rev Prophets. I myself
built an 8 voice polyphonic monster that used these filters. It has now been
added to Dave Kean's Emu museum, and some of the extra left over filter
chips went into Dave's Emu Audity. Problem is, I missed the sound of them as
soon as I got rid of them (to finance my MOTM system!) The 2040 was the most
famous and best sounding SSM filter EVER made.

The bad thing about it is that it was a proprietary 'filter on a chip' that
was sensitive to static, and that can no longer be purchased. See the recent
uproar over on Analogue Heaven about conserving obsolete Curtis chips - same
problem.

Paul's filter will reproduce the SSM topology using modern components. Not
practical for a computer controlled polyphonic machine due to real estate
concerns, but perfect for a modular. This is the perfect 'next' filter in
the MOTM stable - its sound will complement the 2 pole 420. Killer brass and
string sounds!

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

The jacks (8) are:

3 Audio in
3 CV in (1 is 1V/OCT)
1 Q CV in (by popular demand...sigh)
1 Audio Out

The pots (7) are:

3 Audio Attn
2 CV Attn
1 Initial Freq
1 Q initial

Model Number...er.......how about MOTM-440 ?

Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF (can't use
'SSM')

Paul S.

Very nice and straightforward.

If you hate VC Q so much, why do it? They're your modules!

Personally, I'm excited about it. It's the whole reason I'm buying/building
this modular--I want as much control as possible over everything via CVs. I
don't want to have to turn a knob in real-time if I don't have to, because
chances are that after I've CV'd everything I can in a composition, these
two hands are still going to be tweaking real-time anyway. I could use them
anywhere--last night, for example, I wished I had another source for a gate
so I could use the EG the proper way. I ran out of 1/8"->1/4" cables,
though, with TR-606 trigs out, TB-303 CV out, ProSolo outputs... My MOTM is
so small, yet so patched-up! I love my MOTM, and I'll keep loving everything
about it, especially those features that have a control voltage (or FM)
input!

But if it's a significant trade-off in terms of quality, I don't want it,
and quite likely others don't either.


David Bivins.

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Thursday, August 12, 1999 11:55 AM
> To: motm@onelist.com
> Subject: Re: [motm] Next filter - SSM 2040 clone
>
>
> From: "Paul Schreiber" <synth1@...>
>
> The jacks (8) are:
>
> 3 Audio in
> 3 CV in (1 is 1V/OCT)
> 1 Q CV in (by popular demand...sigh)
> 1 Audio Out
>
> The pots (7) are:
>
> 3 Audio Attn
> 2 CV Attn
> 1 Initial Freq
> 1 Q initial
>
> Model Number...er.......how about MOTM-440 ?
>
> Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF (can't use
> 'SSM')
>
> Paul S.
>
>
>
>
>
> --------------------------- ONElist Sponsor ----------------------------
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>

>If you hate VC Q so much, why do it? They're your modules!
>
>
>But if it's a significant trade-off in terms of quality, I don't want it,
>and quite likely others don't either.
>

Well, in 99% of filters, VC Q adds a DC offset from the output back to
the input. This in turn "muddies" up the sound.

However, in this particular filter topology, we use a "trick" because I have
both NPN and PNP matched pairs available. So hopefully, there will not
be this effect.

The prototype filter will be built in mid-Sept. I'll post some MP3 as soon
as it is all checked out.

And per Rocket, yes you can overdrive the snot out of it.

Paul S.

> And per Rocket, yes you can overdrive the snot out of it.

The Q should stay constant in this filter under overdrive, no?

> Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF
> (can't use 'SSM')

How about "Vintage P5 LPF'?

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

Naw, I don't like the references to other synths; the refs to the actual
chip are neat, though. What about "Discrete 2040 LFP"?

> -----Original Message-----
> From: Dave Bradley [mailto:daveb@...]
> Sent: Thursday, August 12, 1999 2:18 PM
> To: motm@onelist.com
> Subject: RE: [motm] Next filter - SSM 2040 clone
>
>
> From: "Dave Bradley" <daveb@...>
>
> > And per Rocket, yes you can overdrive the snot out of it.
>
> The Q should stay constant in this filter under overdrive, no?
>
> > Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF
> > (can't use 'SSM')
>
> How about "Vintage P5 LPF'?
>
> Dave Bradley
> Principal Software Engineer
> Engineering Animation, Inc.
> daveb@...
>
>
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>

I like that also. I think I'll mock up a panel and see how it looks.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

> -----Original Message-----
> From: David Bivins [mailto:david@...]
> Sent: Thursday, August 12, 1999 1:39 PM
> To: motm@onelist.com
> Subject: RE: [motm] Next filter - SSM 2040 clone
>
>
> From: "David Bivins" <david@...>
>
> Naw, I don't like the references to other synths; the refs to the actual
> chip are neat, though. What about "Discrete 2040 LFP"?
>

Duh, I meant LPF, not LFP! :)

> -----Original Message-----
> From: Dave Bradley [mailto:daveb@...]
> Sent: Thursday, August 12, 1999 3:25 PM
> To: motm@onelist.com
> Subject: RE: [motm] Next filter - SSM 2040 clone
>
>
> From: "Dave Bradley" <daveb@...>
>
> I like that also. I think I'll mock up a panel and see how it looks.
>
> Dave Bradley
> Principal Software Engineer
> Engineering Animation, Inc.
> daveb@...
>
> > -----Original Message-----
> > From: David Bivins [mailto:david@...]
> > Sent: Thursday, August 12, 1999 1:39 PM
> > To: motm@onelist.com
> > Subject: RE: [motm] Next filter - SSM 2040 clone
> >
> >
> > From: "David Bivins" <david@...>
> >
> > Naw, I don't like the references to other synths; the refs to the actual
> > chip are neat, though. What about "Discrete 2040 LFP"?
> >
>
>
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>

Here's the mockup, in Windoze BMP format.

Paul, maybe you should write a bitmap to MOTM converter, so we could churn
those modules out faster<g>!

Well, now it exists in pixels, time to put it on the News web page...

Mr. Paintbrush

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Thursday, August 12, 1999 10:55 AM
> To: motm@onelist.com
> Subject: Re: [motm] Next filter - SSM 2040 clone
>
>
> From: "Paul Schreiber" <synth1@...>
>
> The jacks (8) are:
>
> 3 Audio in
> 3 CV in (1 is 1V/OCT)
> 1 Q CV in (by popular demand...sigh)
> 1 Audio Out
>
> The pots (7) are:
>
> 3 Audio Attn
> 2 CV Attn
> 1 Initial Freq
> 1 Q initial
>
> Model Number...er.......how about MOTM-440 ?
>
> Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF (can't use
> 'SSM')
>
> Paul S.
>
>
>
>
>
> --------------------------- ONElist Sponsor ----------------------------
>
> ONElist: the best place to EXPLORE topics, SHARE ideas, and
> CONNECT to people with the same interests.
>
> ------------------------------------------------------------------------
>

Gimme gimme !! (well of course I mean via purchase). That's all I got to
say.
Larry H

> From: "Paul Schreiber" <synth1@...>
>
> >If you hate VC Q so much, why do it? They're your modules!
> >
> >
> >But if it's a significant trade-off in terms of quality, I don't want

it,

> >and quite likely others don't either.
> >
>
> Well, in 99% of filters, VC Q adds a DC offset from the output back to
> the input. This in turn "muddies" up the sound.
>
> However, in this particular filter topology, we use a "trick" because I

have

> both NPN and PNP matched pairs available. So hopefully, there will not
> be this effect.
>
> The prototype filter will be built in mid-Sept. I'll post some MP3 as

soon

> as it is all checked out.
>
> And per Rocket, yes you can overdrive the snot out of it.
>
> Paul S.
>
>
>
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> ------------------------------------------------------------------------

This sounds great to me! I like the module number, and I especially like the
VCQ input <g> since it would further differentiate itself from the 420 & 410.
If you can't do it without sacrificing the sound than I'd (reluctantly) say
let it go -- I appreciate you mentioning that in many cases it "muddies up
the sound," implying it's more than just throwing an OTA in the Q path as I'd
been led to believe.

But wouldn't putting "Ladder" in the name lure some people in to checking it
out who don't know what a 2040 sounds like (like me, who thought I wanted a
"Moog" type VCF -- until now)? Maybe 2040 Ladder VCLPF?

John (approximately one third of the reason Paul sighs about VCQ) Barlow

In a message dated 8/12/99 8:03:56 AM, synth1@... writes:

>Model Number...er.......how about MOTM-440 ?
>Now I need some sort of moniker....Discrete OTA LPF? 2040 VCLPF (can't
>use
>'SSM')

Technically, it's *not* a "ladder structure*. It uses 4 discrete OTA stages
in series.

I want to save the "ladder" word for when I go a true Moog-type LPF.

Paul S.

In a message dated 8/12/99 4:56:15 PM, synth1@... writes:

>Technically, it's *not* a "ladder structure*. It uses 4 discrete OTA stages
>in series.

>I want to save the "ladder" word for when I go a true Moog-type LPF.

DAMN! So many filters, so little cash!

JB

And don't forget the SEM filter, the Xpander filter, ......:)

Paul S.

-----Original Message-----
From: JWBarlow@... <JWBarlow@...>
To: motm@onelist.com <motm@onelist.com>
Date: Thursday, August 12, 1999 8:20 PM
Subject: Re: [motm] Next filter - SSM 2040 clone

>From: JWBarlow@...
>
>
>In a message dated 8/12/99 4:56:15 PM, synth1@... writes:
>
>>Technically, it's *not* a "ladder structure*. It uses 4 discrete OTA

stages

>>in series.
>
>>I want to save the "ladder" word for when I go a true Moog-type LPF.
>
>DAMN! So many filters, so little cash!
>
>JB
>
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>
>ONElist: your connection to people who share your interests.
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Well, of course, one of each is absolutely required.

Larry H (planning a bigger wood case).


----------

> From: Paul Schreiber <synth1@...>
> To: motm@onelist.com
> Subject: Re: [motm] Next filter - SSM 2040 clone
> Date: Thursday, August 12, 1999 8:29 PM
>
> From: "Paul Schreiber" <synth1@...>
>
> And don't forget the SEM filter, the Xpander filter, ......:)
>
> Paul S.
>
> -----Original Message-----
> From: JWBarlow@... <JWBarlow@...>
> To: motm@onelist.com <motm@onelist.com>
> Date: Thursday, August 12, 1999 8:20 PM
> Subject: Re: [motm] Next filter - SSM 2040 clone
>
>
> >From: JWBarlow@...
> >
> >
> >In a message dated 8/12/99 4:56:15 PM, synth1@... writes:
> >
> >>Technically, it's *not* a "ladder structure*. It uses 4 discrete OTA
> stages
> >>in series.
> >
> >>I want to save the "ladder" word for when I go a true Moog-type LPF.
> >
> >DAMN! So many filters, so little cash!
> >
> >JB
> >
> >--------------------------- ONElist Sponsor ----------------------------
> >
> >ONElist: your connection to people who share your interests.
> >
> >------------------------------------------------------------------------
> >
>
>
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Hi All !

I'd like an extra audio out on the mixer .

Vc Q is a good idea .

Discrete 2040 lpf sounds best i reckon :)

Bye for now .


Keep 'em oscillating :)


Hugo (slowly building modules in Brussels ;-) )
=