Hey Karl,
have a look here wrt addressing channels from Pd: you will see that [adc~ 3] is analog input 0, [adc~ 4] is analog input 1 and so on. The same is also explained in the 08-PureData/gettingStarted example.
Note that the vangelisiser is pretty CPU-hungry, therefore it requires running using heavy ( unless you take out some of the voices to make it lighter). To get started with Heavy specifically, have a look here.
To make sure you do not brick the board, check out voltage levels
