http://www.waitingforfriday.com/index.php/USB_RGB_LED_VU_Meter
http://code.google.com/p/perfect-pic-plaground/source/browse/TLC5940+Light+Driver/PIC18F2550/?r=33
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DC vs GS : http://e2e.ti.com/support/power_management/led_driverslcd_bias/f/192/t/46933.aspx
DC is Amps across LED
GS is time period for LED
Sample: http://forums.parallax.com/showthread.php/91003-Driving-TLC5940-4096-step-grayscale-PWM-LED-driver.