I finished creating / extracting the Class 20 engine sound clips this morning. In-between 'real' modelling I spent the rest of the day tweaking the flowchart to get the engine sounds driving how I want them. I'm probably about 90% of the way there with that, and fed up listening to just engine sounds so I added all the previously created 'auxiliary' sounds (horns, air sounds, door slams etc) to see how it all worked as a package. Probably another two or three days tweaking to go and version 1 will be ready. Not sure what to do about a target loco for the video. I've got an early Bachmann (20052) but I don't know if it's the model I want to run with. The speaker certainly won't be as good as the test-bed 26 I'm running the sound in just now.