I use early infantry as musketmen -at least untill I get ring bayonettes. I find it more effective to use Pike units for defensive melee (or agressive positioning to provoke an enemy charge) with wings of musket infantry (line or militia) to flank fire in support of the pikemen.
If you double rank your muskets at 2 rank depth (one unit in front of the other), you can manually advance/retreat the units to ensure more continuous and concetrated fire for greater effect.
Tried to explain it here.
https://forums.totalwar.org/vb/showthread.php?t=116913
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