Hi,
It makes no difference if vstinit is on the header or inside an
instrument apart from the fact that you can't use a vst instrument
handle that hasn't been initialized.
What if you try putting vstinit inside an instrument and calling it some
time after csound has started? Does this make performance more
consistent?

Cheers,
Andres

On Fri, 2006-06-30 at 13:36 +0200, Oeyvind Brandtsegg wrote:
> hello,
>  
> I have a pretty strange thing happening here, seems like csound
> is losing the connection with the dac under certain circumstances.
>  
> I have a large Python application using the csoundAPI, and I use vst
> instruments within csound.
> The loading of vst instruments takes some seconds when csound starts,
> and it seems like this sometimes makes csound lose connection with the
> soundcard.
> The result is that csound does not output any audio, 
> ** but the "overall amp" message printed when csound quits clearly
> indicates that csound has generated audio, since the values are not
> zero **
>  
> This happens approx. one out of of three times when I start the
> application.
> And:
> If use the soundcard's ASIO configuration utility to set the card's
> hardware buffers really high,
> the problem disappears (or happen more seldom). 
> I feel this is not a good situation, as I do not feel confident that
> this won't backfire on me some day.
>  
>  
> I was thinking it might have to do with multithreading issues and that
> my application maybe did not perform the startup tasks always in the
> same order, and that this might be the reason for the inconsistent
> behaviour ( e.g. not failing every time).
> Now I've implemented wait flags in my startup methods, which ensures
> that the same order of execution is performed every time. I've done it
> this way:
> python sends an instrument event to csound, this instrument loads the
> vst plugins
> csound sends a message back to python when the plugins are done
> loading
> This is an excerpt from my python code:
>         # load vst plugins delayed
>         self.csMessages.csoundEventGeneric([1, 0, 1])   # load vst
> plugins
>         while self.csoundVstPluginsReady == 0:  # wait until vst
> plugins loaded in csound
>             time.sleep(0)
>         self.csMessages.csoundEventGeneric([2, 0, 1])   # load banks
> for vst plugins
> ... and so on
>  
> I know that vstplugins would normally be loaded via global statements
> (instr 0), but then I have no control what happens in the time
> interval while csound is loading them. This is why I put the vst
> loading (vstinit opcode) in an instrument.
>  
> any ideas as to what might be going on is greatly appreciated.
> best
> Oeyvind
>  
>  
>  
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