Rob Rothwell wrote:

> Craig,
>
> Thanks for your reply:
>
> >       Just send >>pitch: to the FMSound at the appropriate times, 
> sweeping
> >between your two values?
>
>  I had thought of doing that, but I was hoping that I could end up at 
> a specific frequency at a specific time.  However, for my purposes, 
> the frequencies are more important to me than the times, so that may 
> be what I end up doing.
>
> Basically, I am trying to use Squeak to generate Binaural Beat 
> Sequences for brainwave entrainment.  A Binaural Beat basically 
> consists of a beat at carrier frequency pair, so I want to be able to 
> write something like:

Have you looked at the PitchEnvelope class? It allows you to sweep a 
sound between frequencies.
You would need to take into account that it's working on a logarithmic 
scale, so it does not interpolate frequencies linearly, but musical 
notes. In many cases this would be the desired behaviour, I don't know 
enough about your application to say whether it is acceptable here as well.

Cheers,
Hans-Martin