SynthModules

I'm really intrigued by the potential of the PSIM-1. Unfortunately 
I've never used BASIC and I feel like this definitely will hamper 
my ability to fully use this module. Can anyone recommend 
some sites that give good coverage on the foundations of 
BASIC? I'm really curious as to how a BASIC code can enable 
the module to take on new and different functions. I'm hoping 
that learning some code will make this clearer.
cheers,
John