I first made one of these a few years ago and it works very well. I found some information on a website that appears to have vanished so, I can't include a link here. This is a pretty standard way of doing this so I don't think I am stepping on anyone's toes here.
The inverter chip can be a 7404 or 7407, I personally use the 7407 as I have loads in my junk box. I have also used an AND gate with the inputs joined to make a non-inverting buffer. It depends on the Optoisolator as to whether the output is inverted or not. If it doesn't work try a different buffer chip. Breadboarding is the best way to find a configuration that works for you.
The MIDI IN must not have a ground connected, the MIDI OUTs do have a ground on pin 2 even though this is not shown on the schematic. If you are in doubt about the way to connect a MIDI socket there is loads of information on the web, just ask Google. I would add it here but I can't remember off the top of my head.
As many outs can be added as you want, just add more inverters etc.
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