Overmod, if it's an earlier version, say by BLI in their Paragon or Blueline versions, it will be strictly a BEMF-sensitive chuff that you can manipulate at a given speed and hope it stays relatively synched at higher speeds. By the time they got around to Paragon 2 and beyond, I believe BLI resorted to a reed-switch and magnet arrangment which has an iffy reputation for robustness. I mean, when it works, it's great, but quite a few failures have been reported, generally a couple of hours into its use.
wobblinwheelI was just watching a video demonstrating a BLI Y6b locomotive, and it clearly had a "double-chuff" sound throughout its operation.
You are correct that the double-chuffs would only be heard during 'simpled' startup, and even then the ones from the lead engine would be different from the ones for the HP. It might be interesting to consider the modifications to a sound chip to implement speed-sensitive simpling.
More likely, they simply (no pun intended) adapted the sound setup from their Class A, a prototype which is famous for producing desynchronized 'double licks' throughout its speed range. (I have just bought one to test whether its setup actually reproduces the prototype or just has multiple chuffs timed off some sort of sloppy rotary encoder like the old four-sided nut cam)
wobblinwheelI was just watching a video demonstrating a BLI Y6b locomotive,
One of the downsides of many of the videos out there, weather on Youtube or a commercial DVD is that the sound has been dubbed from any number of sources, not always matched to the particular locomotive or scene being portrayed.
I had posted some old 8mm films that I shot back in the 1960s and '70s and some of the comments I got were, "Great video but the sound is broke".
Unless the photographer had "sound-on-film" or a recording engineer with synchronized sound recording equipment, chances are the video you saw had dubbed sound.
Better than nothing, I guess, but not necessarily accurate.
Regards, Ed
They got it wrong.
And you are correct.
Ed
I was just watching a video demonstrating a BLI Y6b locomotive, and it clearly had a "double-chuff" sound through out it's operation. I was wondering, since the Y6 was a COMPOUND locomotive, would you still hear the double-chuff? Since the rear cylinders exhaust through the front cylinders, wouldn't you only hear ONE SET of chuffs? I know, on start up, the Y6 COULD be in "simple mode", but only for a short distance. Am I right on this?
Mike C.