It's more embarrasing to give wrong answers (like I sometimes do 8) ) DOUT module = DIGITAL out (output signals are either '+5V' or '0'; ONEs or ZEROs) AOUT module = ANALOG out (output signal is within a certain voltage range, like anything between 0V & xV) For an analog VU-meter, you require an analog signal(variable voltage signal, if you like) You can't connect multiple digital output signals together to get higher voltages to display. You'd need a DAC (Digital to Analog Convertor), but this is wat the AOUT is about actually. A DAC works somewhat like this: (each digit of the input represents one input pin; output is on 1 pin) input > output digital > analog 0000 > 0,0V 0001 > 0,1V 0010 > 0,2V 0011 > 0,3V 0100 > 0,4V etc... For a LED bargraph, you need DOUT module(s) While 1 DOUTX4 (4 SR's) has 32 (4x8 ) outputs, you can control more than 32 LEDs if you connect them in a 'matrix' (e.g. 16x16) just like the LEDrings example TK mentioned. Like this not all LEDs are lit simultaneously, but sequencially at a rate so fast that your eyes see them as continuously lit. Converting MIDI CC's to LED bargraphs is not too hard to do. MIOS takes care of all the MIDI handling etc. All you need to do is modify the code so with each incoming CC value the correct digital outputs are addressed, again see the LEDrings example.(look into the mios code, & mios reference files) Converting MIDI CC's to an analog VU is the same principle I guess, but then you need to address the AOUTs. But I never played with that. Maybe a bit too much explanation then required, but I hope you get the idea (& that it's correct what I said :) ) Goodluck, DriftZ