Being a sound engineer, my first thought went to how can we make the
gig sound good? We decided to use
Logic as a mixer to balance the level between the vocals and the guitar, as well as add some reverb, compression and EQ. With only one condenser microphone available to us, plugging the guitar directly into one of the instrument inputs on the interface, allowed us to get a good quality close sound on the vocals and process the guitar with a fair degree of separation. Normally I would prefer to mic an acoustic guitar as opposed to use a DI, but in this situation it worked better and allowed more flexibility. A little bit of subtle EQ can go a long way and in most live gig situations you would see an acoustic plugged in anyway.
Monitoring through headphones from the interface we got it sounding how we wanted it to. Emily was using her in-ear monitors (IEMs) to provide her with the kind of feeling she would be used to on stage. The next question was how to get the sound to YouTube. Using a software called
Soundflower, which acts as an internal sound card to allow you to route audio from one place on your computer to another, I created a Multi Output Device in the Audio Midi Setup application from both the Focusrite interface and Soundflower. By setting Logic's output to the multi output device and YouTube's audio input to Soundflower, the sound would get to both Emily's IEMs and the live stream. There are other alternatives to Soundflower such as
Source Nexus, or many interfaces offer a loop through capability.
Unfortunately at this point we ran into issues with processing power on the laptop. We could alter the buffer size within Logic, but this added too much latency to the IEMs. To get around this we set up a Mac Mini to handle the streaming side. By connecting two balanced jack cables out of the interface connected to Logic, to two line inputs on another interface adjoined to the Mac mini, we got the sound to YouTube. The mix going to YouTube was the same as the monitor mix; however a second mix could have been made on auxiliary busses in Logic had it been needed. This setup worked well; however with a more powerful computer, the second machine would not be necessary.