MOTM

OK...how about a Korg MS-20 LPF with a built in LFO (that gets unswitched
when you plug in a CV) in 1U panel for $99 kit?

And...the Korg PS3100 triple-bandpass filter in a 2U wide for ~$165 kit?
(uses 3 rather $$$ dual Vactrols).

I could probably have BOTH of these ready in 4-5 weeks.

Paul S.
(waiting for more MOTM-700 reviews....)

In a message dated 2/21/99 11:02:34 AM, "Paul Schreiber" <synth1@...>
wrote:

>OK...how about a Korg MS-20 LPF with a built in LFO (that gets unswitched
>when you plug in a CV) in 1U panel for $99 kit?

I'm in for this one, especially if it has an output for the LFO, and if it has
that inverting CV input that I love so much! (is this another module that is
designed to make me stop using banana jacks?)

>And...the Korg PS3100 triple-bandpass filter in a 2U wide for ~$165 kit?
>(uses 3 rather $$$ dual Vactrols).

I'm a little less clear on this module. Is this three independent bandpass
filters in one module? I use bandpass filters much less often than lowpass,
although I do like them. I'm wondering if this means the ladder filter (which
I'm anticipating a great deal) will be further delayed. So I might very well
delay getting one of these depending on what other modules were available at
that time.

John B.
The repentant, if not quite reformed banana jack "Nazi."

> Paul S wrote:
> OK...how about a Korg MS-20 LPF with a built in LFO (that gets unswitched
> when you plug in a CV) in 1U panel for $99 kit?
>
> And...the Korg PS3100 triple-bandpass filter in a 2U wide for ~$165 kit?
> (uses 3 rather $$$ dual Vactrols).
>
> I could probably have BOTH of these ready in 4-5 weeks.

Count me in for one of each. How about an "out" also for that LFO when you
are using CV on the filter. Never can have too many LFOs, right?

> Paul S.
> (waiting for more MOTM-700 reviews....)

Larry H
(waiting to get to building his MOTM-700 tonight)

1) There is no LFO output because there are only 4 jacks in a 1U wide
module.
In this case: IN, OUT, 1 v/OCT IN, CV [variable] IN.

2) The Korg PS3100 uses 3 seperate bandpass filters. They are swept by a
LFO.
Each filter can be set to "go positive" or "go negative" on the LFO. There
is a master
resonance control. The original has all 3 ouputs summed, but if I have room
may have
seperate outputs.

If you have Jean-Michael Jarres' "Oxygene" or "Equinox" this is heard all
over the place.


The LFO I am thinking about splitting off to a general purpose dual VC LFO.
This is a
non-CEM chip design. I should know more in about 10 days.

Moog ladder still in the works...

Paul S.

1) The MS-20 filter LFO is just sort of tossed in as a "freebie". The CV MOD
pot can turn it all
the way off.

BTW: I may just have a 2U wide complete MS-20 filter with switchable HP/LP
sections.

2) For best effects, yes the LFOs need to be sync'd. The PS3100 filter has
no LFOs itself: the
LFOs are in a seperate module and yes they have sync.

Paul S.

-----Original Message-----
From: Gur Milstein <gur-m@...>
To: motm@onelist.com <motm@onelist.com>
Date: Monday, February 22, 1999 8:36 AM
Subject: [motm] Re: Korg filter ideas #2

>From: Gur Milstein <gur-m@...>
>
>At 06:17 PM 2/21/99 -0600, you wrote:
>>From: "Paul Schreiber" <synth1@...>
>>
>>1) There is no LFO output because there are only 4 jacks in a 1U wide
>>module.
>>In this case: IN, OUT, 1 v/OCT IN, CV [variable] IN.
>
>what about a syncable LFO,and when a cv is not patch is that meen the lfo
>would change the cutoff all the time ?
>
>
>>2) The Korg PS3100 uses 3 seperate bandpass filters. They are swept by a
>>LFO.
>>Each filter can be set to "go positive" or "go negative" on the LFO. There
>>is a master
>>resonance control. The original has all 3 ouputs summed, but if I have

room

>>may have
>>seperate outputs.
>
>agin is this LFO can be syncable ?
>i dont see much use for a non syncable lfo in a vcf,it reminds me the MAM
>resonator
>which its lfo are non syncable and thats is sad as its a great filter.
>
>i would buy the MS-20 vcf .
>
>thanx
>Gur Milstein
>
>
>------------------------------------------------------------------------
>Come see our new web site! http://www.onelist.com
>

All this talk about the MS-20 filter and I realized I don't know the first
thing about it. Is it 2 pole or 4?

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

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Monday, February 22, 1999 8:46 AM
> To: motm@onelist.com
> Subject: [motm] Re: Korg filter ideas #2
>
>
> From: "Paul Schreiber" <synth1@...>
>
> 1) The MS-20 filter LFO is just sort of tossed in as a "freebie".
> The CV MOD
> pot can turn it all
> the way off.
>
> BTW: I may just have a 2U wide complete MS-20 filter with switchable HP/LP
> sections.
>
> 2) For best effects, yes the LFOs need to be sync'd. The PS3100 filter has
> no LFOs itself: the
> LFOs are in a seperate module and yes they have sync.
>
> Paul S.
>

Hi Paul n All !

Thought i'd chip in here .

The charm/goodness of the MS20 filter section is also due to it being
a band pass filter, with separatly modulatable freq, res, and mix
from the front panel . The module you propose is much more in the
skinny Doepfer philosophy . I'd rather see a full scale module, with
VC res on both sections, several modulation schemes (see
Synthesource, Curtis publ) and built in mixers .

This last point may open a debate, but synths without input mixers
are a pain in the ass . Just look at any real life Synton modular
setup, more mixers than other modules . The ARP Odyssey is so
versatile because of its mixers ... etc . If one had VC mixers as
well, now that would be something ... (this also goes for other
modules) .

If any LFO's are included, make them sync-able to external input,
good for repeatability of resulting sweeps . If this is not liked,
do not use it :)

Still in "world beater" thinking mode ;-)

Take care .


Keep 'em oscillating :)


Hugo
=

Input mixers (I guess there are 2: audio and CV) are nice. Mainly, it's
just a cost & panel space issue.

The MS-20 MOTM filter will be a 2U wide HP/LP as in the real unit. Design
is underway as we speak.

Me, I'm bringing up MOTM VCO pcb #1 !!

Paul S.

> Hugo Haesaert wrote:
> The charm/goodness of the MS20 filter section is also due to it being
> a band pass filter, with separatly modulatable freq, res, and mix
> from the front panel . The module you propose is much more in the
> skinny Doepfer philosophy . I'd rather see a full scale module, with
> VC res on both sections, several modulation schemes (see
> Synthesource, Curtis publ) and built in mixers .

Hell yes! If we're gonna spend our time making a filter, let's follow the
MOTM philosophy and do it first class.

> Thought i'd chip in here .

Excellent chip'pin. <grin>

> Still in "world beater" thinking mode ;-)

Don't ever change that thinking mode. Those of us out here not yet savvy
enough to know what to ask for really appreciate this kind of input and how
these great ideas get run right past Paul.

Now forgive me for not knowing, but it's time for me to say "thanks" to the
person with the vision and commitment to create the [motm] list. Some of
this stuff might seem a bit commercial on Synth-diy and I appreciate not
feeling limited by the guidelines of that list for this discussion
(although I do indeed love that list too).

Larry Hendry

At 06:17 PM 2/21/99 -0600, you wrote:

>From: "Paul Schreiber" <synth1@...>
>
>1) There is no LFO output because there are only 4 jacks in a 1U wide
>module.
>In this case: IN, OUT, 1 v/OCT IN, CV [variable] IN.

what about a syncable LFO,and when a cv is not patch is that meen the lfo
would change the cutoff all the time ?

>2) The Korg PS3100 uses 3 seperate bandpass filters. They are swept by a
>LFO.
>Each filter can be set to "go positive" or "go negative" on the LFO. There
>is a master
>resonance control. The original has all 3 ouputs summed, but if I have room
>may have
>seperate outputs.

agin is this LFO can be syncable ?
i dont see much use for a non syncable lfo in a vcf,it reminds me the MAM
resonator
which its lfo are non syncable and thats is sad as its a great filter.

i would buy the MS-20 vcf .

thanx
Gur Milstein