Are you referring to the Bachmann Spectrum 2-8-0 Consolidation? If so, Yes I have installed a sound decoder on three of them. I did the normal installation of a lenz decoder in the engine itself for the motor and the head lamp, but I installed a digitrax SFX004 SoundBug in the tender. I replaced the speaker that comes woth the decoder with a Soundtraxx 1 X .56* oval speaker. I had to shave a bit of the coal load on the bottom for the decoder, speaker and capacitor to fit. I drilled holes in the floor of the tender and rtv'd the speaker facing down. The sound is great! When coupled to the engine, you would swear the sound is coming from the engine itself. You have to program the decoder at the same address as the engine decoder and also program the sound decoder by the engine driver size the sync the sound to the engine. This is a bit of trial and error, but once you get the decoder sync'd it looks and sounds great. The digitrax decoders come with standard Steam sound bits programed into the decoder, but You can reprogram the decoder with your own sounds. I have been working on this to change the Chuff for a bit Larger engine I want to put this decoder in. I know there are better sound decoders out there, but for the price I am pretty satisfied with the digitrax decoders. The secret with sound decoders is to keep the sound low. We are modeling in a small scale and the sounds they create should be a complement to the model and not detract from everything else we have modeled on the layout. I hope this answers your question..
Experience is a wonderful thing. It enables you to recognize a mistake when you make it again.