Wow! Nicely done. Just a few questions.
– this assumes that the single stereo track is selected before you start
2x Cmd+D – at this point you have 4 stereo tracks, all selected
SPLIT STEREO TRACK – Split which stereo track? I’ll assume the top one
Shift+Cmd+A – unselect all, top track has keyboard focus?
2x Down – move focus to third track
Return – select it
Shift+Cmd+0 – Tracks > Stereo to Mono
Shift-K – select the track just converted to mono
– a very sneaky way of selecting the Amplify effect!
Ctrl-Fn-F2 – selects the Apple menu
8x Right – selects the Effect mneu
3x Down – selects the Amplify effect
Return – chooses the Amplify effect
4x Fn+Del – removes test from the “Amount” box
“-4” – enters “-4” in the amount box
Return – apply the Amplify effect
Shift+Cmd+A – unselect all
Down – since the mono track has focus, this moves down to the (now) fourth track, which is a copy of the original
Return – select the track
Shift+Cmd+0 – Tracks > Stereo to Mono
Shift-K – select the track just converted to mono
– OK, I’m getting the hang of this 
– apply the Low Pass Filter with cutoff 180 Hz to the track
Ctrl-Fn-F2
8x Right
Down
“low”
Return
Tab
4x Fn+Del
“180”
Return
Shift+Cmd+A
Down
Return
Shift-K – bottom stereo track (last remaining copy of the original) is selected
SPLIT STEREO TRACK – assume you mean to split the selected track?
Cmd+D – now have 4 copies of that split stereo track - 2 left and 2 right
Shift+Cmd+A
Down
Return
Shift-K - you’ve selected the right channel of the split stereo track
– apply the Invert effect
Ctrl-Fn-F2
8x Right
Down
“i”
Return
– and apply the Amplify effect with gain -3 dB
Ctrl-Fn-F2
8x Right
3x Down
Return
4x Fn+Del
“-3”
Return
Shift+Up – select the left channel of the split stereo pair
Shift+Cmd+9 – mix and render, creating a new stereo track at the bottom of the track area
Return – select that new track
Shift+Cmd+0 – convert to mono
– select the left channel of the remaining split stereo pair
Shift+Cmd+A
2x Up
Return
Shift-K
– invert it
Ctrl-Fn-F2
8x Right
Down
“i”
Return
– amplify by -3 dB
Ctrl-Fn-F2
8x Right
3x Down
Return
4x Fn+Del
“-3”
Return
– select the stereo pair, mix and render and convert to mono
Shift+Down
Shift+Cmd+9
Return
Shift+Cmd+0
Shift+Up
– at this point the bottom “mix” track is selected
Ctrl-Fn-F2
8x Right
Down
“de”
Return
2x Fn+Del – you are in the “decay” box. This box could contain any value, so should do more deletes to clear it?
“10” – type “10”
3x Tab – leaving the default delay time and pitch change? Shouldn’t you set these just to be sure?
2x Fn+Del
“1” – 1 echo
Return
Ctrl-Fn-F2
2x Right
Down
“ex” – selects “Export Multiple”
2x Up – go up to the “Export” command
– all these returns assume that the export location is OK and channel mapping is OK.
Return
Return
Return
Return
After all this is done, you have 6 tracks in the project. What are they? They appear to be (from top to bottom), left-front, right-front, center, LFE, left-rear and right-rear. Why the delay in only one rear channel?
– Bill