Hi all,

I'm wondering if anyone else is experiencing maddening xruns when
using the McCurdy 'mode' example from his realtime collection. 'Mode'
is a great-sounding instrument, and has many possibilities, but at
least on my little EEE-PC running Arch Linux and jackd, doesn't seem
real-time ready, because of lots and lots of crackly xruns whenever
the MIDI activity gets at all remotely intense...

I've tried all the usual suspects (buffer size, sample rate reduction,
ksmps increase) to no avail...is it just that 'mode' is particularly
inefficient, or very CPU hungry? Could htere be a bad bug in the code
that is causing this issue?

Best,
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org


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Interesting, with the new parser I get a message:

Too many file/macros

(compiled csound a few days ago, not sure if this has been fixed)

Regarding mode, it's essentially a biquad filter that has had some
parts optimized out.

I've taken a look at the Native Instruments Prism instrument and its
quite nice.  I was building a recursive mode UDO instrument a couple
months ago but have been sidetracked since; hopefully will get back to
it in a week from now.

Question though for the community, does anyone have any code for
bowing excitation?  I've used vco2 with a saw wave in the past as an
simple approximation but would rather have something more genuine in
terms of physical modeling.

Thanks!
steven

On Wed, Jan 18, 2012 at 5:36 AM, Iain McCurdy  wrote:
> Hi Aaron,
>
> Here are stripped down UDO versions of the mode instruments that remove most
> of the paraphernalia of the original example. They might provide a more
> useful and efficient starting point. You could try and replace mode with
> reson and see if that is more efficient, I suspect it may be similar in
> performance terms though. There may just be a limit to how much resource
> saving can be achieved on a netbook. I notice also that Native Instruments
> has a product that implements modal synthesis. It might be intestesting to
> see how effectively it performs in realtime, I don't have it to try though.
>
> Bye,
> Iain
>
>> Date: Tue, 17 Jan 2012 13:51:04 -0600
>> From: aaron@akjmusic.com
>> To: csound@lists.bath.ac.uk
>> Subject: [Csnd] 'mode' performance
>
>>
>> Hi all,
>>
>> I'm wondering if anyone else is experiencing maddening xruns when
>> using the McCurdy 'mode' example from his realtime collection. 'Mode'
>> is a great-sounding instrument, and has many possibilities, but at
>> least on my little EEE-PC running Arch Linux and jackd, doesn't seem
>> real-time ready, because of lots and lots of crackly xruns whenever
>> the MIDI activity gets at all remotely intense...
>>
>> I've tried all the usual suspects (buffer size, sample rate reduction,
>> ksmps increase) to no avail...is it just that 'mode' is particularly
>> inefficient, or very CPU hungry? Could htere be a bad bug in the code
>> that is causing this issue?
>>
>> Best,
>> Aaron Krister Johnson
>> http://www.akjmusic.com
>> http://www.untwelve.org
>>
>>
>> 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"
>>


Send bugs reports to the Sourceforge bug tracker
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Discussions of bugs and features can be posted here
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