Putting sound in a DCC Fitted Class 8 R3151X

[Shoeburyness Fat Boy]

What sound decoder chip do I need to fit sound in a Hornby R3151X Class 08 Shunter 08129 in BR Blue that I have recently bought. Having opened it up I can see how it is achieved. It says DCC fitted so it must be able to be done, but with so little space I am baffeld. It came out around 2013 I believe so may not be possible.

[RDS]

@Graham

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[Chrissaf]

This recent thread might offer some clues. Not your specific model, but still a DCC fitted Class 08 upgrade to sound.

https://uk.hornby.com/community/forum/adding-tts-sound-to-mixed-freight-set?ccm_paging_p=1

[96RAF]

Compare the service sheets for the three basic model variants,

DCC-Fitted with 8-pin socket, Sound-Fitted with earlier 21-pin decoder and TTS-Fitted with current 8-pin decoder.

The standard speaker is a small rectangular one fitted in front of the radiator.