Martin Love love LOVE the 101. I feel like a new person. Thank you! But here's my question: I recorded myself singing back-up vocals onto 4 separate tracks. I was using plug-ins and automation on each individual track to get the proper blend, volume and sound. Then I watched your 101 module on using sends and realized that I could route all 4 BU Vox through a single bus. That way I could control the volume, EQ, compression etc from one channel. In other words, I created a sub mix for the BU Vox. But what I don't understand is the difference bewteen routing the 4 tracks to BUS 1 via a "send" button and routing them via the I/O button. Just being able to make a sub mix is a huge leap for me and given how many BU Vox I do, an enormous time and energy saver. But which is the proper way to do it? Send or I/O? Thanks!