Well, a so called mate got himself an Auscision HO scale AN class locomotive the other day and wanted me to put sound in it for him. I eventually caved in as he's the type that if he touches something - kaboom!
I made him test the loco itself under DC before he handed it to me, which he did - all the lights and the motor worked fine. So here is what I had to work with after he'd removed the DC board.
The ESU LokSound decoder is a 21 pin version and it just plugged in without any wiring at all - saweeeeet.
The shell for the loco was then put on and fitted well - just fitted in fact!. Then it was onto the ESU Programmer and the sound file pushed to the loco. I used the ESU "S0531-LS5H0DCC-Diesel-EMD-16-710G3A-T-V4-R4" sound file from their website after my mate tracked down that the AN class had an EMD 16 cylinder 710G3A donk in them.