linuxaudio.org

On Thu, 2010-02-04 at 20:30 +0100, Emanuel Rumpf wrote:

quoted text
> 2010/2/4 Arnold Krille :

> > On Thursday 04 February 2010 18:50:28 Emanuel Rumpf wrote:

> >> Has anyone ever played a plugin in realtime ( live )...

> >> ...and I don't mean a one-finger melody, but a mutli-polyphonic piano

> >>  piece, eventually with sustain held down, which resulted in about 20 to 40

> >>  simultaneusly processed voices.

Yes.
> > Yes, I have. I believe Ken Restivo, Atte Andre Jensen and many others too.

quoted text
> >

> Reliably ? At a latency below 10 ms ?

> Which synth ? I don't intend to mistrust you, but I remain

> disbelieving for now. :-)

>

> Linuxsampler is well written and reliable, but

> when playing intensely, it xran too here.

I've been working for a while in a piece for real-time synthesis /

sample playback and a piano controller (and pedals, etc, etc). I

normally play with my laptop, a dual core lenovo t61 running the latest

rt patched kernel and: linuxsampler at 96 voices max (4 different piano

samples), two instances of the supercollider synthesis engine doing

synthesis and spatialization, a program in supercollider controlling the

whole thing (including the GUI feedback screen for the performer),

jconvolver for convolution reverb and ambdec for ambisonics decoding.

All with a PCMCIA RME card and a Multiface running at 128x2 48KHz. 
It can glitch but if it does it is because it has actually run out of

cpu (and I have had a couple of instances in rehearsal where I'm playing

textures so thick that the supercollider scheduling queue has filled up

with not so good results, argh :-)
All in all quite reliable (I played an earlier version of the piece in

last year's LAC). 
-- Fernando
> >> We have dedicated hardware for graphics, why not for audio ?

quoted text
> >

> > There are manufacturers selling dedicated PCI-cards to do VST-plugin work and

> > free your cpu of that.

> >

> Interesting, although uneligible for my laptop..

>

> > But whats the purpose of running some piece of (almost)

> > generic software on generic platforms, when you still need specialised

> > hardware?

> >

> Being generic means (for the platform) to support a bunch of

> specialised applications.

> It doesn't bother much to buy additional hardware, in order to make

> the system more generic, but not being able to make it

> generic enough for being able to use it for a cerain specialised application.

> We are used to extend the systems usability through additional peripherials

> such as graphic-cards, audio-cards, printers....

> That's what has made it a success.

>

>

> > Of course you can buy dedicated audio-hardware. Its called keyboards and

> > synths and mixers and effects (outboard).

> >

> These make me lose the generality.

>

> > But isn't it easier to have it all in software and carry it around on your

> > pc/laptop/usb-stick?

> >

> It absolutely would, if it gave me the same reliability.

>

>

> > Please give us some pointers to help you improve performance on your definitely

> > un-tuned and probably mis-configured system before making our work bad in

> > general.

> >

> I'm not making it bad. I'm even searching for a way to

> make it more valueable by making it more usable.

>

> I don't think my system is so badly configured - how to measure ?

> It's not the most recent hardware, I admit.

>

>

> > Have fun,

>

> Thanks

> 

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