Thank you for your reply Severn. I have done what you mentioned for single modern dummy engines and created a lot of cool sound tracks with Audacity with recordings of real trains I recorded. This set up is for older A-B-B-A diesels where all units will have the same sound as the lead engine. With bluetooth your limited to one speaker per one transmitter. What I was looking for with my post, was a cleaner pre-amplified sound off the circuit board or a way to get rid of the amplification in the line into a mini amplified speaker. The mini speakers are picking up spikes when the sound is turned up in the lead engine more then half way because output is too strong for the aux input of the mini speakers. Now in WillyGee's project there is a mention in one of your post of installing a 10K ohm resistor in each speaker line before the FM transmitter. Can you tell me what the purpose of doing that is?
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