MOTM

How wide is the notch? Does the FREQ knob set the low end or high end or
some other point for this setting?

What are the "6 ways" to connect 2 420s?

How do FM1 and FM2 affect the filter?

Are IN1, IN2 and IN3 all routed through the filter? If so, how do you
minimize the filtering to use it just as a mixer?

Sorry if this is way too basic for some of you...

Todd

Actually, there are 12 ways to connect 2 3 mode filters...

Mr. Chroma

> >What are the "6 ways" to connect 2 420s?
>
> LP + LP
> LP + Notch
> LP + HP
> HP + HP
> HP + Notch
> Notch + Notch
>

>From: "Tentochi" <tentochi@...>
>
>How wide is the notch? Does the FREQ knob set the low end or high end or
>some other point for this setting?

The "narrowness" is proportional to the Q setting. FREQ sets the 'center
point' of the Notch.

>
>What are the "6 ways" to connect 2 420s?

LP + LP
LP + Notch
LP + HP
HP + HP
HP + Notch
Notch + Notch

>
>How do FM1 and FM2 affect the filter?

They are summing pots for the control voltage. More CV >> cutoff of filter
increases

>
>Are IN1, IN2 and IN3 all routed through the filter? If so, how do you
>minimize the filtering to use it just as a mixer?

You can't *right now*. There is a little opening in the panel *begging* for
a MIX OUT jack....hmmmmmm....

Paul S.

But, kind sir, it makes NO difference if you LP + HP or HP + LP. So you
eliminate
all of the "reverse" cases!

Paul S.
thinking in the frequency domain


-----Original Message-----
From: Dave Bradley <daveb@...>
To: motm@onelist.com <motm@onelist.com>
Date: Friday, May 14, 1999 10:07 AM
Subject: Re: [motm] 420 Questions

>From: "Dave Bradley" <daveb@...>
>
>Actually, there are 12 ways to connect 2 3 mode filters...
>
>Mr. Chroma
>
>> >What are the "6 ways" to connect 2 420s?
>>
>> LP + LP
>> LP + Notch
>> LP + HP
>> HP + HP
>> HP + Notch
>> Notch + Notch
>>
>
>
>------------------------------------------------------------------------
>ONElist: bringing the world together.
>http://www.onelist.com
>Join a new list today!
>

True, kind sir, but you miss my point.

Take your six cases, then throw into the mix hooking the two filters up
either in SERIES or PARALLEL.

Gives you totally different sounds!

Mr. Chroma
thinking in the patchcord domain

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Friday, May 14, 1999 10:22 AM
> To: motm@onelist.com
> Subject: Re: [motm] 420 Questions
>
>
> From: "Paul Schreiber" <synth1@...>
>
> But, kind sir, it makes NO difference if you LP + HP or HP + LP. So you
> eliminate
> all of the "reverse" cases!
>
> Paul S.
> thinking in the frequency domain
>
>
> -----Original Message-----
> From: Dave Bradley <daveb@...>
> To: motm@onelist.com <motm@onelist.com>
> Date: Friday, May 14, 1999 10:07 AM
> Subject: Re: [motm] 420 Questions
>
>
> >From: "Dave Bradley" <daveb@...>
> >
> >Actually, there are 12 ways to connect 2 3 mode filters...
> >
> >Mr. Chroma
> >
> >> >What are the "6 ways" to connect 2 420s?
> >>
> >> LP + LP
> >> LP + Notch
> >> LP + HP
> >> HP + HP
> >> HP + Notch
> >> Notch + Notch
> >>
> >
> >
> >------------------------------------------------------------------------
> >ONElist: bringing the world together.
> >http://www.onelist.com
> >Join a new list today!
> >
>
>
> ------------------------------------------------------------------------
> ONElist: the best source for group communications.
> http://www.onelist.com
> Join a new list today!
>

Two 2 pole LPF in series, tuned to the same frequency = one 4 pole LPF. Same
for HPF. Sharper cutoff slope, different sound.

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

> -----Original Message-----
> From: Tentochi [mailto:tentochi@...]
> Sent: Friday, May 14, 1999 3:22 PM
> To: motm@onelist.com
> Subject: Re: [motm] 420 Questions
>
>
> From: "Tentochi" <tentochi@...>
>
> How does a LP + LP sound different that a single LP? Some for HP?
>
> > >What are the "6 ways" to connect 2 420s?
> >
> > LP + LP
> > LP + Notch
> > LP + HP
> > HP + HP
> > HP + Notch
> > Notch + Notch
>
>
> ------------------------------------------------------------------------
> ONElist: the best source for group communications.
> http://www.onelist.com
> Join a new list today!
>

How does a LP + LP sound different that a single LP? Some for HP?

> >What are the "6 ways" to connect 2 420s?
>
> LP + LP
> LP + Notch
> LP + HP
> HP + HP
> HP + Notch
> Notch + Notch

> From: Tentochi <tentochi@...>

-----------------snip---------------------

> Sorry if this is way too basic for some of you...
>
> Todd

Nothing is too basic for me Todd. and as they say, "there are no stupid
questions." Keep 'em coming. Maybe we will all learn something.

Larry H.

In a message dated 5/14/99 6:59:44 AM, synth1@... writes:

>>Are IN1, IN2 and IN3 all routed through the filter? If so, how do you
>
>>minimize the filtering to use it just as a mixer?
>
>
>
>You can't *right now*. There is a little opening in the panel *begging*
>for
>
>a MIX OUT jack....hmmmmmm....

I'm probably missing something here (what's new?), but can't you just use the
inputs as a mixer in the ordinary way take the Lopass output but use minimum
Q and maximum cutoff freq. (with nothing at the CV inputs)? Wouldn't this be
a simple signal mixer of the type desired?

JB

>I'm probably missing something here (what's new?), but can't you just use

the

>inputs as a mixer in the ordinary way take the Lopass output but use

minimum

>Q and maximum cutoff freq. (with nothing at the CV inputs)? Wouldn't this

be

>a simple signal mixer of the type desired?

Congrats! You figured it out!

Paul S.

I also remembered that the Minimoog has no provision for AM in the audio
range on the VCA, and to get audio AM one needs to modulate the filter CV
input with one of the VCOs in the audio range. So maybe you can sell the 420
as a mixer with audio AM capabilities, and as a bonus, a VC filter is thrown
in as well.

John B.

In a message dated 5/14/99 6:02:50 PM, JWBarlow@... writes:

>From: JWBarlow@...
>
>
>In a message dated 5/14/99 6:59:44 AM, synth1@... writes:
>
>>>Are IN1, IN2 and IN3 all routed through the filter? If so, how do you
>>
>>>minimize the filtering to use it just as a mixer?
>>
>>
>>
>>You can't *right now*. There is a little opening in the panel *begging*
>>for
>>
>>a MIX OUT jack....hmmmmmm....
>
>I'm probably missing something here (what's new?), but can't you just use
>the
>inputs as a mixer in the ordinary way take the Lopass output but use minimum
>
>Q and maximum cutoff freq. (with nothing at the CV inputs)? Wouldn't this
>be
>a simple signal mixer of the type desired?
>
>JB
>

Most filters will affect high frequency signals even if you crank the Freq
all the way up. If you are trying to mix midrange audio signals or low
frequency control voltages, no problem. Otherwise, you will probably get
some interaction.

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

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Friday, May 14, 1999 9:22 PM
> To: motm@onelist.com
> Subject: Re: [motm] 420 Questions
>
>
> From: "Paul Schreiber" <synth1@...>
>
> >I'm probably missing something here (what's new?), but can't you just use
> the
> >inputs as a mixer in the ordinary way take the Lopass output but use
> minimum
> >Q and maximum cutoff freq. (with nothing at the CV inputs)? Wouldn't this
> be
> >a simple signal mixer of the type desired?
>
> Congrats! You figured it out!
>
> Paul S.
>
>
>
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