[chuck] std.mtof?

[jesus gollonet]

hi world. i've been dabbling for a while with chuck now, and have a 
little doubt

i've seen this in various of the provided examples (this one is from the 
band-o-matic.ck

// pentatonic
2 * std.rand2( 0, 4 ) => int freq;
if( freq == 6 ) 7 => freq;
if( freq == 8 ) 9 => freq;
std.mtof( (float)( 21 + std.rand2(0,5) * 12 + freq ) ) => band.freq;
if ( std.randf() > 0.7 ) 
    std.rand2(0,3) => band.preset;
}


and i see that it generates a pentatonic scale (in fact i've used it as 
provided and works). But i don't
really understand how it works. i can get the first three lines, but i 
don't now what std.mtof is for, so i can't guess what it is for.

any  kind helping hand?


thanx a lot.

the deeper i know chuck, the more i love it!!

cheers!