[QLab] Buffer Problem

[Christopher Ashworth]

On Mar 19, 2007, at 4:57 AM, Matthew Otto wrote:

> Hi List,
> 	We are using QLab 1.1.1 on a show down in DC and we are  
> experiancing an aubile delay between the push of the spacebar and  
> the actual execution of the Q. Its happening to most if not al of  
> our Qs. We think its either the buffer or a delay with the hot key.  
> The machine is a 1.25GHz Powerbook G4 with 1.25GB of RAM. through a  
> 828 mk1 driver version: 1.4. Any and all help is greatly appreciated.
>

Hi Matt,

Here is at least one thing to check:

In general, if the cue has not been preloaded for some reason (which  
is quite possible e.g. with hot keys) this can introduce an audible  
delay.  Sound cues load their buffer before playing if they haven't  
already been preloaded, and especially with a large buffer size or a  
compressed audio format (or both) that can introduce an audible delay.

If the cue is preloaded, however, playback should begin within a  
millisecond or so.  (I assume you've checked to make sure the cues  
have no dead space at the beginning.)

You could also try playing the cues out the built-in output to see if  
there is an audible difference between that and the 828 mk1.  If so  
perhaps there is a driver issue involved.

Chris