Well my 'shoebox' is now trundling around the layout, on diesel power only so far. The poor running was (mostly) sorted by using the CV54 trick and reading the CV's back into the program. I've got basic auxiliary sounds working (horns, compressor, air release etc). Once I've made a bit more progress on these I'll move on to the electric sounds. The last stage I suspect, apart from the usual endless tweaking, will be to program the transitions from diesel to electric and visa versa. I'm quite pleased so far anyway.