I'd like to have an RGB LED beside each encoder in my 64 Encoder LEDring MIDIbox NG beast.   An 8x8 colour matrix can easily be driven by a single DOUTx4 module.   1SR drives the 8 cathode rows, and remaining 3SR's drive the red,green, and blue anodes. Here's a circuit:   If the standard SRIO scan rate is used, then each row is illuminated for 1ms each 8ms. This equates to 125Hz refresh rate.   To obtain different colours we need to adjust the brightness of red, green and blue separate