There are probably many ways of doing that but you can connect the output of the midi note number to the object "%" with the "12" value. Example: every C# note will give you a value of 1. Then with "select" object you can use it to trigger whatever you want with a bang.

Cheers,

example patch:

Brilliant, thanks mate I'll try it tonight!

Does exactly what I need, thanks so much! Just need to figure out how to make it send a CC to another track now..