Peiman,

I've built 4th order State Variable Filter Modules using the old 
SSMT chip sets (SSM-2040 VCF IC) and that was definitely not a
limited experience. We got some wild and wonderful filter response
curves out of that. Could get some curves with high-Q's and emphasis
or some very smooth and subtle roll-off responses. My dream filter 
module. Wonder if you could cascade a couple of those svfilters and 
get higher orders out of them. There's one or two State Variable 
VCF's in the Csound manual (I forget which one) that are 2nd order 
you might be able to cascade to make a 4th order VCF. Wonder what 
kind of curves you could get with that.


Cheers,
-Partev


===================================================================



--- Mark.Van.Peteghem@telenet.be wrote:

From: Mark Van Peteghem 
To: csound@lists.bath.ac.uk
Subject: Re: [Csnd] statevar filter
Date: Tue, 08 Mar 2011 22:01:16 +0100

I'll give it a try then. I've examined a lot of other filters in CSound. 
I've read that the nice sound of analog synthesizers is due to their 
non-linearity, while most filters in CSound are linear. The only 
exceptions that I know are moogvcf, moogvcf2, moogladder and lpf18. I 
tried these to simulate the Korg monotron using a sketch posted here 
recently. I liked the moog filters most, lpf18 was in between these and 
linear filters, but none of them sounded as good as the real thing.

I shortly experimented with a free VST in another application, that did 
filtering with resonance on square and saw waveforms, which sounded 
better that the filters of CSound. Does this mean that CSound lacks a 
good non-linear filter? Or maybe I just didn't find the right 
parameters, although I tried a variety of parameters?

Mark

peiman khosravi wrote:
> Well I am just judging by my ears and the very limited experience, and
> of course the nature of the sounds that I am putting through the
> filters and the manner in which I am changing the filter parameters. I
> tried the following filters just today:
>
> Butterworth filters
> atone
> svfilter
> bqrez
>
> I also really like svfilter. But it seems that statevar is more stable
> for my purpose.
>
> I would be interested to hear about other filters that I have missed
> and that may give me similar results.
>
> Thanks
>
> P
>
>
> On 7 March 2011 22:55, Rory Walsh  wrote:
>   
>> To be honest, I didn't expect the overhead to be at all noticeable.
>> Your remark that it sounds better than the other filters you've tried
>> in Csound intrigues me. I'm assuming you tried your fair share of
>> Csound filters!
>>
>> On 7 March 2011 22:38, peiman khosravi  wrote:
>>     
>>> I am not running out of CPU here.
>>>
>>> And I do need all four filters. But honestly, I don't think the
>>> overhead is that much. It does sound so superior to the other filters
>>> I tried in Csound (must be the oversampling).
>>>
>>> P
>>>
>>>
>>> On 7 March 2011 21:00, Rory Walsh  wrote:
>>>       
>>>> You took the text out of my finger tips. Surely it'll only add
>>>> overhead unless you actually need all four filters? Ok, overhead is
>>>> exaggerating it a little but I guess you know what I mean..
>>>>
>>>> Rory.
>>>>
>>>>
>>>>
>>>> On 7 March 2011 20:52, Mark Van Peteghem  wrote:
>>>>         
>>>>> I've seen it before in the manual, but I thought it's only useful if you
>>>>> need all four filters, or if you need somewhat better quality. Is it really
>>>>> that much better?
>>>>>
>>>>> Mark
>>>>>
>>>>> peiman khosravi wrote:
>>>>>           
>>>>>> Just wanted to say that I did not know about this opcode until today.
>>>>>> It sounds amazing! I'm so glad to have found it.
>>>>>>
>>>>>> Thanks Victor.
>>>>>>
>>>>>> Best,
>>>>>>
>>>>>> Peiman
>>>>>>             



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_____________________________________________________________
Netscape.  Just the Net You Need.


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Thanks Paterv,

I shall try them all!

Best,

Peiman

On 9 March 2011 23:21, Partev Barr Sarkissian  wrote:
> Peiman,
>
> I've built 4th order State Variable Filter Modules using the old
> SSMT chip sets (SSM-2040 VCF IC) and that was definitely not a
> limited experience. We got some wild and wonderful filter response
> curves out of that. Could get some curves with high-Q's and emphasis
> or some very smooth and subtle roll-off responses. My dream filter
> module. Wonder if you could cascade a couple of those svfilters and
> get higher orders out of them. There's one or two State Variable
> VCF's in the Csound manual (I forget which one) that are 2nd order
> you might be able to cascade to make a 4th order VCF. Wonder what
> kind of curves you could get with that.
>
>
> Cheers,
> -Partev
>
>
> ===================================================================
>
>
>
> --- Mark.Van.Peteghem@telenet.be wrote:
>
> From: Mark Van Peteghem 
> To: csound@lists.bath.ac.uk
> Subject: Re: [Csnd] statevar filter
> Date: Tue, 08 Mar 2011 22:01:16 +0100
>
> I'll give it a try then. I've examined a lot of other filters in CSound.
> I've read that the nice sound of analog synthesizers is due to their
> non-linearity, while most filters in CSound are linear. The only
> exceptions that I know are moogvcf, moogvcf2, moogladder and lpf18. I
> tried these to simulate the Korg monotron using a sketch posted here
> recently. I liked the moog filters most, lpf18 was in between these and
> linear filters, but none of them sounded as good as the real thing.
>
> I shortly experimented with a free VST in another application, that did
> filtering with resonance on square and saw waveforms, which sounded
> better that the filters of CSound. Does this mean that CSound lacks a
> good non-linear filter? Or maybe I just didn't find the right
> parameters, although I tried a variety of parameters?
>
> Mark
>
> peiman khosravi wrote:
>> Well I am just judging by my ears and the very limited experience, and
>> of course the nature of the sounds that I am putting through the
>> filters and the manner in which I am changing the filter parameters. I
>> tried the following filters just today:
>>
>> Butterworth filters
>> atone
>> svfilter
>> bqrez
>>
>> I also really like svfilter. But it seems that statevar is more stable
>> for my purpose.
>>
>> I would be interested to hear about other filters that I have missed
>> and that may give me similar results.
>>
>> Thanks
>>
>> P
>>
>>
>> On 7 March 2011 22:55, Rory Walsh  wrote:
>>
>>> To be honest, I didn't expect the overhead to be at all noticeable.
>>> Your remark that it sounds better than the other filters you've tried
>>> in Csound intrigues me. I'm assuming you tried your fair share of
>>> Csound filters!
>>>
>>> On 7 March 2011 22:38, peiman khosravi  wrote:
>>>
>>>> I am not running out of CPU here.
>>>>
>>>> And I do need all four filters. But honestly, I don't think the
>>>> overhead is that much. It does sound so superior to the other filters
>>>> I tried in Csound (must be the oversampling).
>>>>
>>>> P
>>>>
>>>>
>>>> On 7 March 2011 21:00, Rory Walsh  wrote:
>>>>
>>>>> You took the text out of my finger tips. Surely it'll only add
>>>>> overhead unless you actually need all four filters? Ok, overhead is
>>>>> exaggerating it a little but I guess you know what I mean..
>>>>>
>>>>> Rory.
>>>>>
>>>>>
>>>>>
>>>>> On 7 March 2011 20:52, Mark Van Peteghem  wrote:
>>>>>
>>>>>> I've seen it before in the manual, but I thought it's only useful if you
>>>>>> need all four filters, or if you need somewhat better quality. Is it really
>>>>>> that much better?
>>>>>>
>>>>>> Mark
>>>>>>
>>>>>> peiman khosravi wrote:
>>>>>>
>>>>>>> Just wanted to say that I did not know about this opcode until today.
>>>>>>> It sounds amazing! I'm so glad to have found it.
>>>>>>>
>>>>>>> Thanks Victor.
>>>>>>>
>>>>>>> Best,
>>>>>>>
>>>>>>> Peiman
>>>>>>>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>
>
>
>
> _____________________________________________________________
> Netscape.  Just the Net You Need.
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>


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