clean-up: #41

yet another small piece of code i found in my supercollider extensions folder.

it's very basic and just generates a pwm signal (pulse-width modulation). you could do the same thing quicker with the standard LFPulse, but sometimes it's good to roll your own just to see another approach.

Pwm {
        *ar {|freq= 100, width= 0.5|
                ^>(width* -2+1);
        *kr {|freq= 100, width= 0.5|
                ^>(width* -2+1);
//mouse controls pwm duty cycle
{,, 1))!2*0.2}.play
//simulating voltage
{,, 1))).poll;}.play