Changing Softsynths

[terrence@xxxxxxxxxxxxxxx (Terrence van Ettinger)]

How can I change the softsynth used for Speakup?  I made the mistake of 
using the same one, Festival, for both Speakup and Orca, and now when I 
start Speakup, I kill the voice for Orca.  So how can I fix this?

Thanks,
Terrence