Hi All,
I've long had ideas rattling round the empty space that should be filled with brain about ambient sound and maybe some chuffing sounds for Crook Street. Until recently I haven't been convinced by the available sound chips for steam (always been good for diesel) but they really have come on leaps and bounds. A while back I devised a scheme and bought some cheap-as-chips speakers and MP3 player boards as well as a timer that I'd need from ebay.
I'd admired the excellent Norwich Central layout on the exhibition circuit recently and they used DCC sound in the foreground goods yard and DC without sound on the high level passenger station at the rear of the layout - not unlike Crook Street in 'sound area' terms. The lack of sound on the upper station was not obtrusive at all as there was plenty chuffing going on in the foreground.
For a home layout and one that gets filmed, I needed some ambient sounds as the real world is full of it. You don't tend to notice it if, say, you're watching a preserved steam loco, but you do notice it when it's absent. So I figured I needed station sound, steam shed sound and (for Deansgate) warehouse sound to get me started.
Next thing I reckoned was to have push-button triggered shunting sounds (wagons clanking and groaning) for both Crook Street and Deansgate (same sound). And finally, I'd bite the bullet and fit sound chips to the two shunters.
The trickiest bit was how to provide chuffing sounds for the main running lines. To answer the obvious question of why I didn't go for sound chips for all locos is that it's a lot of effort and expense and I wanted the extra bass you can get with stand alone speakers. Anyway, I figured I'd need two starting locations, the station or the yard as well as two valve gear types (different exhaust beat), Joy or Stephensons (Straight Link, if you're an LNWR man). In addition the sound needed to travel with the train, so I also needed an exit speaker that could play either sound file. So after a bit of gear grinding in aformentioned sparsly populated brain space I came up with a switching and file selection process that made it all work. I'll spare you the details but I can spell it out if anyone's mad/interested enough.
Here's one of the MP3 players:
I found that the functionality is quite restricted, most importantly that it won't remember settings on power down, so I'd need one player per sound file and I'd need 4 sound files: Joy Start; Link Start; Joy Depart; Link Depart. At around a fiver each, no one's complaining!
Left to their own devices, the little beasties would simply play the files repeatedly forever unless you press buttons, which I didn't want to have to do, so I needed a timer to power them off every time my train had finished chuffing:
Again, el-cheapo and is quite useful and has a few modes which suggests itself as an alternative to having to furkle around programming Arduini and Raspberry Pi. I can do that but to be honest, I rather build railway stuff!
So I ended up with a board containing all the relevant bits and bobs and some choc block contacts to enable some thuggish wiring to avoid the delicate contact blocks on the units. Electronic engineers (I know there's a few of you out there) may want to look away at this point...:
I also needed some switches, one to select the start location, station or yard, and one for the valve gear type. Additionally I wanted a play button, which starts the timer, which in turn starts the selected players:
I housed the speakers in some ply boxes, which improves the sound immesurably. Don't worry hi-fi manufacturers, you can sleep easy in your beds I'm sure...:
Last but not least are the sound files themselves. I'd been collecting sounds from various internet sources and my own films at heritage lines for years so I'd accumulated quite a few appropriate ones. I edited them together using the same Shotcut editor I use for the movies, just saved as MP3 files. The BBC sound archive is a wonderful resourse! For the chuffing moving with the train, I simply had the same file (one for Joy, one for Link) and faded the Start File at the end (timed to coincide with the train passing under the bridge) and the Depart File faded at the beginning.
So, next steps are to acquire some sound chips for the shunters and let's see if it works in the movies
If it works and I ever get round to building the steelworks, I have a whole cacophony of sound lined up for that!
Cheers
Allan