I have a consist of two engines one with Tsunami sound the other without. I seem to remember reading somewhere that there is a setting to help make the tsunami sound like multple engines. Am I right about that? I did play with the reverb settings and that seemed to help.
I’m assuming what the OP is asking about is for two diesels, not two steam engines.
Anyway, I know what he’s talking about, but I might have to dig a bit to find the link again. Someone posted something a year or two back that if you have a Tsunami with reverb, you can set the reverb to be what in music is called a “slap back” echo, so you get the exact same sound repeated a fraction of a second later than the original sound.
The person who posted it was doing it to use a 1st generation EMD single-motor sound decoder (like for a GP or SD) to replicate the two-motor sound of an EMD E-unit…so maybe a search on something like “Tsunami E-unit reverb” might come up with a link??
You can simulate a prime mover in a A unit and B unit with a decoder in only one unit. He does not mention if there should be a speaker in each unit but it can be done.
I have a F3 with one speaker in the A unit and two speakers in the B unit with one decoder in the A unit which powers the A unit motor and B unit motor.