Change Tempo as a Function of Time

[Mitchonii]

I'm looking to increase the tempo of songs overtime. I have figured out how to change the tempo, but only using the the edit tab. As well, the tempo is increased by a constant for the whole song, and I am looking to make it increase linearly overtime. I don't think there is a quick tool to do this, and I have no idea how the Nyquist editor works to do such a thing. I have had some experience with Matlab, which uses a system of coding that looks similar to some things I've seen online, so I might understand some things if you can give me some instructions.

I'm just looking to increase it with a function similar to Y = T + M*t
where "M" is the rate of increase in tempo;
"t" is time(s);
"T" is the original tempo of the song;
"Y" is the increased tempo

I think a 5% increase per minute is a good starting point.
If anybody has ever played "Boom Boom Rocket" for the Xbox 360, I am aiming for an effect similar to the Endurance Mode, where the song gets faster as you progress.

Could anybody help start me off in the right direction or give me a code that I can try learn from?

Thanks to all who respond!

[Irish]

This effect is available in version 1.3.
In the Effect Menu, click on "Sliding Time Scale / Pitch Shift".

If you don't have version 1.3, the latest release, 1.3.11, is available here:
http://audacityteam.org/download/

You can have both 1.2 and 1.3 installed on your computer, but you can only have one of them running at any time.
1.2 projects can be opened in 1.3, but 1.3 projects can't be opened in 1.2.

PO'L

[Mitchonii]

Thank you very much. Your help is very much apprecieated!