Hey hey,

I just released the numbers sample pack:

http://juliencoder.de/sound/numbers-1.0.zip

It contains the numbers 0 to 20 in both English and German as well as some 

other calculator related words like minus, integral, function, logarithm, etc. 

The samples were made with espeak-ng and a modified voice variant. The pack 

also contains two scripts to create the numbers 0 to 20 in every language that 

is available for both espeak-ng and Apple's say.

The samples are CC-BY 4.0. Have fun and create some calculator beats. :)

Best wishes,

Jeanette