Try opening up the filter at the higher frequency end of the filter, 
when in the higher sampling rate. Keep the upper frequency cut-off well 
within the Nyquist criteria, so that there won't be any frequency fold 
back at that sample rate. 


-PBS


--- pete.soundtechnician@GMAIL.COM wrote:

From:         Peter Burgess 
To:           CSOUND@LISTSERV.HEANET.IE
Subject: Re: [Csnd] Higher sample rates sound dull...
Date:         Sun, 28 Feb 2016 17:03:31 +0000

I've got audio rate and low frequnecy AMs between square waves. That
could be causing the effect then I guess! Good shout. I shall add some
frequency foldover to see if it replicates the lower sample rate
examples

On Sun, Feb 28, 2016 at 4:47 PM, Justin Smith  wrote:
> my guess is that frequency foldover distortion in the instrument adds some
> of the edge to the lower SR items, and the higher sr changes or eliminates
> the foldover
>
> I use intentional frequency foldover in fm synthesis for generating noise -
> I've thought about looking at other algorithms so that I wouldn't be
> generating a timbre that depends entirely on the rendering sample rate, but
> the sr foldover does give me the rough / harsh textures I'm looking for (and
> it's very easy to end up with foldover in fm synthesis - you could be using
> it without realizing it if you use fm).
>
> On Sun, Feb 28, 2016 at 8:04 AM Peter Burgess
>  wrote:
>>
>> Hi there, I've been messing around with some man made Csound music for
>> a change, and exorted a short measure in several sample rates. I've
>> noticed that the higher sample ratess (88.2kHz and 96kHz) sound much
>> less vibrant than the lower ones. Anyone know why this is?
>>
>> My best guesses are that either my hardware/software doesn't support
>> these higher sample rates properly, or that the higher sample rate is
>> indeed increasing the clarity and quality, and infact reducing some
>> kind of noise otherwise present in the lower sample rates, which to my
>> ears makes the audio sound richer, or brighter.
>>
>> --
>> http://algorythmradio.com
>> https://soundcloud.com/algorythmradio
>>
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>         https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
>
> Csound mailing list Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features can
> be posted here

That's all good! The lack of foldover was causing me grief on the
higher sample rates like you suggested. So I've added foldover back in
with a higher sample rate and it sounds lush again :D good shout!

On Mon, Feb 29, 2016 at 7:44 PM, Justin Smith  wrote:
> sorry, the most it can do is remove artifacts based on frequency cutoff, it
> is powerless to prevent the foldover which already happened
>
> On Mon, Feb 29, 2016 at 11:43 AM Justin Smith  wrote:
>>
>> a filter can't help with frequency foldover caused by your method of
>> synthesis - the foldover is already there in the audio data before filtering
>> is applied, and the most it can do is remove it based on a frequency cutoff
>>
>> On Sun, Feb 28, 2016 at 7:32 PM Partev Barr Sarkissian
>>  wrote:
>>>
>>> Try opening up the filter at the higher frequency end of the filter,
>>> when in the higher sampling rate. Keep the upper frequency cut-off well
>>> within the Nyquist criteria, so that there won't be any frequency fold
>>> back at that sample rate.
>>>
>>>
>>> -PBS
>>>
>>>
>>> --- pete.soundtechnician@GMAIL.COM wrote:
>>>
>>> From:         Peter Burgess 
>>> To:           CSOUND@LISTSERV.HEANET.IE
>>> Subject: Re: [Csnd] Higher sample rates sound dull...
>>> Date:         Sun, 28 Feb 2016 17:03:31 +0000
>>>
>>> I've got audio rate and low frequnecy AMs between square waves. That
>>> could be causing the effect then I guess! Good shout. I shall add some
>>> frequency foldover to see if it replicates the lower sample rate
>>> examples
>>>
>>> On Sun, Feb 28, 2016 at 4:47 PM, Justin Smith 
>>> wrote:
>>> > my guess is that frequency foldover distortion in the instrument adds
>>> > some
>>> > of the edge to the lower SR items, and the higher sr changes or
>>> > eliminates
>>> > the foldover
>>> >
>>> > I use intentional frequency foldover in fm synthesis for generating
>>> > noise -
>>> > I've thought about looking at other algorithms so that I wouldn't be
>>> > generating a timbre that depends entirely on the rendering sample rate,
>>> > but
>>> > the sr foldover does give me the rough / harsh textures I'm looking for
>>> > (and
>>> > it's very easy to end up with foldover in fm synthesis - you could be
>>> > using
>>> > it without realizing it if you use fm).
>>> >
>>> > On Sun, Feb 28, 2016 at 8:04 AM Peter Burgess
>>> >  wrote:
>>> >>
>>> >> Hi there, I've been messing around with some man made Csound music for
>>> >> a change, and exorted a short measure in several sample rates. I've
>>> >> noticed that the higher sample ratess (88.2kHz and 96kHz) sound much
>>> >> less vibrant than the lower ones. Anyone know why this is?
>>> >>
>>> >> My best guesses are that either my hardware/software doesn't support
>>> >> these higher sample rates properly, or that the higher sample rate is
>>> >> indeed increasing the clarity and quality, and infact reducing some
>>> >> kind of noise otherwise present in the lower sample rates, which to my
>>> >> ears makes the audio sound richer, or brighter.
>>> >>
>>> >> --
>>> >> http://algorythmradio.com
>>> >> https://soundcloud.com/algorythmradio
>>> >>
>>> >> Csound mailing list
>>> >> Csound@listserv.heanet.ie
>>> >> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> >> Send bugs reports to
>>> >>         https://github.com/csound/csound/issues
>>> >> Discussions of bugs and features can be posted here
>>> >
>>> > Csound mailing list Csound@listserv.heanet.ie
>>> > https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
>>> > https://github.com/csound/csound/issues Discussions of bugs and
>>> > features can
>>> > be posted here
>>>
>>>
>>>
>>> --
>>> http://algorythmradio.com
>>> https://soundcloud.com/algorythmradio
>>>
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>         https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>>>
>>>
>>>
>>>
>>> _____________________________________________________________
>>> Netscape.  Just the Net You Need.
>>>
>>> Csound mailing list
>>> Csound@listserv.heanet.ie
>>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>>> Send bugs reports to
>>>         https://github.com/csound/csound/issues
>>> Discussions of bugs and features can be posted here
>
> Csound mailing list Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features can
> be posted here