Well if your realy want to blow yourself up thats you choice.
check out these sorts of things.

http://www.icircuits.com/prod_dtmf8plus.html

All you would need is 2 walkitalki`s and a DTMF Generator.
This works with 8 Relays.
Maybee 8 seperat 10 stage Timing devices. that would give you 80 trigers.
10 per triger. I aint gonna help you anymore.
You should be able to figure out the rest from there on.

Regards
Wombat.

The link above is all you need.
read the description, and figure it out. You can have several boxes linked
to the same audio input.
God how hard can it be. !