This is my take on the system:
pin 1 = Power supply (+) all channels
pin 4 = output from 1 side of totem pole for that channel
pin 7 = other output from other side of totem pole for that channel
pin 10 = Power supply ground (-) for all channels
pin 9 = appears as current sense shutdown circuit output
pin 5 = contols the right side drive to the left side transistors on that channel
pin 17 is controlling the signal that is being given off by pin 11 - I dunno why.
Pin 18 appears to affect/regulate the voltage going to op amp that monitors output current.
pin 6 = same as 5 but for right side of drive, that channel
pin 8 = non inverting input to current sense circuit op-amp - appears to be ground reference for current sense resistor.
The other pins not listed are basically mirrored functions of the circuits listed above.