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1V/Oct on filter

2009-12-16 by dr.jasoncrest

I understand the concept of the 1V/Oct on an Osc. but what exactly does this mean on a filter? Thanks!

Re: 1V/Oct on filter

2009-12-16 by sascha victoria

if you apply 1v/oct to the 1v/oct input on the filter it will track with the 1v/oct you have applied to the oscillator. if you play up the keyboard the filter will open with the same ratio as the oscillator. if you go down, the filter goes down. dig?

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On Tue, Dec 15, 2009 at 8:27 PM, dr.jasoncrest <dr.jasoncrest@...> wrote:

I understand the concept of the 1V/Oct on an Osc. but what exactly does this mean on a filter? Thanks!

Re: 1V/Oct on filter

2009-12-16 by dr.jasoncrest

Thanks a million for taking the time to answer.

I guess that's where some of the confusion, at least in the technical meaning, comes in for me. Typically I'm using another type of control voltage other than a keyboard into the 1v/oct input on the filter.
This reminds me of another question I've had in the back of my mind. What's the difference between frequency modulation and 1v/oct input on an oscillator other than the fact that frequency modulation is scalable? The result sounds similar to me.

Wishing I'd majored in electronic music,
Jason

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--- In SergeModular@yahoogroups.com, sascha victoria <sascha.victoria@...> wrote:
>
> if you apply 1v/oct to the 1v/oct input on the filter it will track with the
> 1v/oct you have applied to the oscillator. if you play up the keyboard the
> filter will open with the same ratio as the oscillator. if you go down, the
> filter goes down. dig?
>
>
>
>
> On Tue, Dec 15, 2009 at 8:27 PM, dr.jasoncrest <dr.jasoncrest@...>wrote:
>
> >
> >
> > I understand the concept of the 1V/Oct on an Osc. but what exactly does
> > this mean on a filter? Thanks!
> >
> >
> >
>

Re: 1V/Oct on filter

2009-12-16 by Dennis Verschoor

The 1 volt.oct input can be used for lin fm.

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On Wed, Dec 16, 2009 at 6:08 AM, dr.jasoncrest <dr.jasoncrest@...> wrote:

Thanks a million for taking the time to answer.

I guess that's where some of the confusion, at least in the technical meaning, comes in for me. Typically I'm using another type of control voltage other than a keyboard into the 1v/oct input on the filter.
This reminds me of another question I've had in the back of my mind. What's the difference between frequency modulation and 1v/oct input on an oscillator other than the fact that frequency modulation is scalable? The result sounds similar to me.

Wishing I'd majored in electronic music,
Jason

--- In SergeModular@yahoogroups.com, sascha victoria <sascha.victoria@...> wrote:
>
> if you apply 1v/oct to the 1v/oct input on the filter it will track with the
> 1v/oct you have applied to the oscillator. if you play up the keyboard the
> filter will open with the same ratio as the oscillator. if you go down, the
> filter goes down. dig?
>
>
>
>
> On Tue, Dec 15, 2009 at 8:27 PM, dr.jasoncrest <dr.jasoncrest@...>wrote:

>
> >
> >
> > I understand the concept of the 1V/Oct on an Osc. but what exactly does
> > this mean on a filter? Thanks!
> >
> >
> >
>

--
Music at: http://mono-poly.blogspot.com/

Re: 1V/Oct on filter

2009-12-16 by ty hodson

If the 1V/Oct inputs on an oscillator and a (e.g. low pass) filter track the same source, you’ll notice the filter opens up as the pitch increases, and the filter closes down as the pitch decreases. This translates to higher pitches sounding “brighter” and lower pitches sounding “darker” – i.e. it sounds very natural to our ears and approximates the behavior of acoustic instruments.

_______________
http://sublevel9.net

From: SergeModular@yahoogroups.com [mailto: SergeModular@yahoogroups.com ] On Behalf Of dr.jasoncrest
Sent: Tuesday, December 15, 2009 8:27 PM
To: SergeModular@yahoogroups.com
Subject: [SergeModular] 1V/Oct on filter

I understand the concept of the 1V/Oct on an Osc. but what exactly does this mean on a filter? Thanks!

Re: 1V/Oct on filter

2009-12-16 by Bakis Sirros

hi Dennis,

??
what i know is that the 1volt/oct input is an unscaled input for Exponential FM, either of an OSC, or of the filter cutoff. it is not a Linear FM input. that is valid for all 1volt/oct inputs of all modules, regardless of manufacturer.

thanks,
Bakis.

Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
[Doepfer_a100] group owner
www. parallel - worlds - music. com
www. myspace. com/ parallelworldsmusic
www. myspace. com/ interconnectedmusic
www. myspace. com/ memorygeist
www. DiN. org. uk
www. musicamaximamagnetica. com
www. shimarecords. co. uk
www. rubberrecords. gr
Athens - Greece

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--- On Wed, 12/16/09, Dennis Verschoor <modular@...> wrote:

From: Dennis Verschoor <modular@...>
Subject: Re: [SergeModular] Re: 1V/Oct on filter
To: SergeModular@yahoogroups.com
Date: Wednesday, December 16, 2009, 7:11 AM

The 1 volt.oct input can be used for lin fm.

On Wed, Dec 16, 2009 at 6:08 AM, dr.jasoncrest <dr.jasoncrest@ yahoo.com> wrote:

Thanks a million for taking the time to answer.

I guess that's where some of the confusion, at least in the technical meaning, comes in for me. Typically I'm using another type of control voltage other than a keyboard into the 1v/oct input on the filter.
This reminds me of another question I've had in the back of my mind. What's the difference between frequency modulation and 1v/oct input on an oscillator other than the fact that frequency modulation is scalable? The result sounds similar to me.

Wishing I'd majored in electronic music,
Jason

--- In SergeModular@ yahoogroups. com, sascha victoria <sascha.victoria@ ...> wrote:
>
> if you apply 1v/oct to the 1v/oct input on the filter it will track with the
> 1v/oct you have applied to the oscillator. if you play up the keyboard the
> filter will open with the same ratio as the oscillator. if you go down, the
> filter goes down. dig?
>
>
>
>
> On Tue, Dec 15, 2009 at 8:27 PM, dr.jasoncrest <dr.jasoncrest@ ...>wrote:

>
> >
> >
> > I understand the concept of the 1V/Oct on an Osc. but what exactly does
> > this mean on a filter? Thanks!
> >
> >
> >
>

--
Music at: http://mono- poly.blogspot. com/

Re: 1V/Oct on filter

2009-12-16 by John P

Hmm. I thought the point of expo filter tracking was to have all the notes sound the same. The body of an acoustic instrument
acts as a fixed filter bank, one that does not change with pitch.

ty hodson wrote:

Show quoted textHide quoted text

If the 1V/Oct inputs on an oscillator and a (e.g. low pass) filter track the same source, you’ll notice the filter opens up as the pitch increases, and the filter closes down as the pitch decreases. This translates to higher pitches sounding “brighter” and lower pitches sounding “darker” – i.e. it sounds very natural to our ears and approximates the behavior of acoustic instruments.

ty

Re: 1V/Oct on filter

2009-12-17 by wavemultiplier

If you have a high resonance set and feed the same voltage (coming from wherever) to the filter and the OSC, then the resonant point/pitch and the pitch of the OSC will maintain the same relationship.

Re: 1V/Oct on filter

2009-12-17 by jwbarlow@aol.com

In a message dated 12/17/2009 4:35:47 P.M. Pacific Standard Time, crash49@... writes:

If you have a high resonance set and feed the same voltage (coming from wherever) to the filter and the OSC, then the resonant point/pitch and the pitch of the OSC will maintain the same relationship.

Yes!

The "cutoff frequency" of the filter will *track* with the oscillator.

I have to say I actually prefer to attenuate the VC frequency of a VCF so that it is between 1.5V to 2V per octave. To my ears (and a few others I've talked to) that seems more the way non-electronic instruments behave.

John B.