The 2020 release is DCC sound ready. Utilising a 21 pin plug and speaker under the chassis, decoder installation is a relatively simple affair. First, the body and cab needs to be removed from the walkway. The handrails and details parts are fragile so caution should be applied.
If access to the speaker is required, it is a simple matter of removing two screws from the underside the fuel tank and slipping the fuel tank off from the chassis.