I have been playing around a little more with the sounds in 10001. I have settled for the moment on the class 37 sounds and horns, with the 37 engine sounds being a little more 'raw' than the more controlled class 31 sounds. The low tones of the 37 horns semm suitable, until I can locate something online that shows what the real single-tone horns actually sounded like. CV123 can be set with values from 0 to 5 to get the six separate sets of engine sounds. CV120 and 121 set the forward and reverse horn sounds. I had a little problem with 10001 surging at low speeds, so have tweaked CV211 for the BEMF settings - currently set to its highest value of 255 until I can work out a better combination of values in all of the related CVs that also influence and control the BEMF. I must check to see if I removed the capacitors too, as they can affect the operation of the BEMF on some decoders, whereas some other decoders seem unaffected by these.