The way attacks work if skilled in two weapon combat is as follows.
The use of two weapons enables the character to make one additional attack each combat round, with the second weapon. The character gains only one additional attack each round, regardless of the number of attacks he may normally be allowed. Thus, a warrior able to attack 3/2 (once in the first round and twice in the second) can attack 5/2 (twice in the first round and three times in the second).
However since most of the two weapon users are 14th lvl the ratio is 3 attacks per rd with two weapons. 2 attacks primary 1 attack secondary.
Example Arandur's rapiars.
WEAPONS
+3 Rapiar of Arvoreen (In combat wielder gains +3 to strength. Adds +2 to hit vs. Creatures over 6’ feet. Does triple damage when wielder is under 20 hit points. Attuned to a single enemy chosen by wielder. When struck enemy must save vs. Death Magic or die. Sm/Med: 1d6+3 / LG: 1d6+3 #ATKS: 2)
+2 Rapiar of Stunning (Stuns any living creature hit for damage for 1d4 rounds (Save vs. spell to negate) Sm/Med: 1d6+2 / LG: 1d6+2 #ATKS: 1)
Total attacks per rd thus becomes 3
Also Ody the off hand rapiers stun ability was nagated