Design TTS sound specifically for steam engines.
Works well, good sound quality. Instructions are limited. Should be plug and go! A basic instruction sheet should be provided with for that specific model.
There was no way it would fit in the model, the speaker should have been a sugar cube one or equivalent so it will all fit neatly, simply into the fire box. It should be manufactured like this in the first place as opposed to taking a diesel design, change the sound accordingly and hope it will fit. Naughty of Hornby and below the standard I expect of them. Don’t sell a product until it is ready. I did my own adaption and it does work well.
You will be better off buying a TTS fitted version in the first place when you factor into its costs!
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