Hi.  Earlier tonight, I listened to Jonathan Mosen's excellent demo of the new 
Audio Hijack 3.  Jonathan mentioned that it was possible to record just 
VoiceOver and the microphone without recording system audio.  Well I managed to 
accomplish this, so I thought I'd write up how I did it, in case other people 
may want to do this.
My goal was to have three output files.  I wanted an isolated VoiceOver track, 
an isolated microphone track, and a mix of the two.  I probably would only ever 
need the mix, but if the levels were really uneven, I could fix it later with 
the isolated tracks.  Also, I wanted to ensure that while I was recording, I 
didn't hear the mic echoing back.  

In order to record VoiceOver, you need two application source blocks.  One for 
VoiceOver, and one for com.apple.speech.  If you just do VoiceOver, all you get 
are the VO sound effects.  In order to select those apps, when you're in the 
pop over for the source block, and you're focussed on the choose application 
popup button, route your mouse there, and do an option click.  This shows you 
all the running applications that are normally hidden.  Note that when you set 
up those two source blocks, you need to make sure the "fill gaps with silence" 
checkbox is checked in the advanced section of the pop over.  If you don't do 
this, the audio from VO and the audio from your mic will quickly go out of sync.

I think the best way to explain the session will be to first describe how it 
works, followed by the block layout with co-ordinates.  First we have our two 
VO source blocks. These are arranged vertically.  They are both connected to 
our output device block.  This ensures that we can hear VoiceOver once the 
session is running.  This output block, goes to a record block.  You might 
change the output file name created by this block to something like VoiceOver.

A few rows down from those blocks, we have our microphone source block.  This 
connects to a second record block. You might have the files created by this 
block called something like Microphone.  
Between these two sections of blocks, we have a third record block.  Our other 
two record blocks connect here.  Call the files created by this block something 
like Mixed.  

So here is the actual block layout for the session.  
x1 y1: application source block: com.apple.speech
x2 y1: device output block: probably your headphones
x3 y1: record block, VoiceOver
x1 y2: application source block: VoiceOver
x4 y2: record block, Mixed
x1 y4: device source block: microphone
x2 y4: record block, Microphone

If you lay out the blocks like that, all the connections should happen properly.

Well hopefully that made at least some sort of sense.  If it didn't, it's 
probably my fault, as I'm writing this at 4 in the morning.  Which now that I 
think about it, probably wasn't one of my brightest ideas.
Darcy

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