Are those amplitudes of the sources are random or fixed?
regardless, you can use sweep to assign the amplitudes: you may setup an analysis group to include those sources, and set the amplitudes as variables, and assign each amplitude to the source correspondingly. You can also set this in "model".
Once you parameterize the amplitudes, you can sweep them, either randomly or preset values in the analysis group or "model".
Please note that the transmission calculation assumes those sources are incoherently summed up. If they are coherent, you will need to calculate their coherent power and renormalize the result. in addition, the acutal simulation is coherent. Therefore the locations and initial phases of the sources may affect the final result. If you have questions regarding to this, please write a new post.
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