If so you can just script those cues whose patch is 2 to copy the levels from sliders 1 & 2 to sliders 3 and 4 , take out sliders 1&2 and change the patch to 1.
Mic
tell application id "com.figure53.QLab.4" to tell front workspace
set thecues to cues whose q type is "audio" and patch is 2
repeat with eachcue in thecues
set s1 to (getLevel eachcue row 0 column 1)
set s2 to (getLevel eachcue row 0 column 2)
set m11 to (getLevel eachcue row 1 column 1)
set m12 to (getLevel eachcue row 1 column 2)
set m21 to (getLevel eachcue row 2 column 1)
set m22 to (getLevel eachcue row 2 column 2)
setLevel eachcue row 0 column 3 db s1
setLevel eachcue row 0 column 4 db s2
setLevel eachcue row 0 column 1 db -100
setLevel eachcue row 0 column 2 db -100
setLevel eachcue row 1 column 3 db m11
setLevel eachcue row 1 column 4 db m12
setLevel eachcue row 2 column 3 db m21
setLevel eachcue row 2 column 4 db m22
set patch of eachcue to 1
end repeat
end tell