As the new Stanier class, 5 has just been published and the 4mt tender engine already been published it only makes sense that you introduce the tank engine version of it
Apart from the main add-on uploaded to the Digital Traction website, if your looking for more variety, Steam Sounds Supreme have created an enhancement pack which includes all preserved examples as well as BR early and late crests in both clean and weathered states. Not to mention some updated sounds and also headboards to give a bit extra flavour. http://www.steamsoundssupreme.com/page_4073299.html