Go to RR and get the 4 channels you want to hear.
open sdrtrunk
if you haven't yet, go to view user preferences, JMBE and click create library(or whatever the create words are). let it download - this is for audio
close the preferences screen
under the spectrum and where you see LEFT ----, click Playlist editor
Click the "channels" tab > new > p25 phase 1. Put info for the "system,site,name" as you want to. Only the name really matters.
I think this is the correct way of doing it -- but I don't have any way to test for 100% certainty.
All 4 frequencies will go in the "source" dropbox. Type frequency and press add. Do 3 more times then click save, then play(clicking play will ask you to save).
If it doesn't work, try going to the p25 P2 option under new and clicking "individual channel" to see if that works.
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