Hi Michael,
Yes, it is possible for you to do this. You will need to create 5 versions of your application, each of them in the different language.
For each version of the application, you will want to select the appropriate Voice and Language for your application. To do this, you would need to click on the Configure tab of your application. From there, click on the Settings tab to go to the Configuration settings for your application.
Under Sound and Feel, you can click on the drop-down menu for Voice and Language and select the appropriate voice for your application. For example, for your Spanish version of your application, you could choose Rosa.
Then, your digits prompts would be said as "uno dos tres quatro" (as long as you remember to select the "spell out digits" option for your prompt).
Hope this helps.
Regards,
The QuickFuse Team