Rather than reply in a thread on screenshots, thought I’d continue this discussion here (regarding the AP Class 40). I’ve not tried the 40 in 32 bit yet, will try later and see if there’s any difference to my ears. Just personally, I’ve not heard anything glaring when playing 64 bit. I don’t know how it all works, or have looked at the folders, but would have thought all sounds are just from looped files? You have a train starting up sound, but once it’s running, there’s not going to be a file of 1 hour of stable running, no acceleration or deceleration. You’d think there’s maybe be a few minutes looped? Or is a base sound somehow ‘sampled’ in the 64 bit version? How does it all work? Why would 32 or 64 bit make a difference?