Hi,I have had my class 20 for 9 months now and have been fitting dcc sound into my n gauge fleet gradually since the beginning of this year.Currently I have fitted Zimo MX648 sound decoders in my Farish class 24,37 and class 50 and have fitted Loksound v4micro's in my Farish class 40 and 47.
My preference is to use the Zimo's as opposed to the Loksounds but with Legomanbiffo's sound files being so good,they're very hard to resist.Having said all that,Paul Chetter's latest Digidrive sound projects are incredibly good to drive so once his latest class 20 sound project is on the market I'll be very close to the front of the queue for one of these.
Having had the body off to have a look at sound fitting viability,I would say that the speaker will most definately need to go in the cab as the chassis top doesn't look like there is space to fit it on top there.Likewise the fuel tanks,these look way too small.My preferred way of fitting sound to n gauge is to remove the pcb and hardwire the decoder and rewire the lights,adding resistors as required although on these,the bonnet lights are on a contact strip from the pcb so this needs to be worked around to get an ideal solution.
Having done a Farish class 24 already,mine having the speaker in the tanks,I must say that this was a tight fitting installation so unless someine chooses to fit a CT Electronik CT SL76 plug in sound decoder,I expect that removal of the pcb is the only way to go,in my opinion of course.
Pete