In your track select any instrument data in any channel, then select your replacement instrument where you have all of your instruments, and after that go to Edit -> Replace Instrument.
It takes a while to get used to, but you will find it extremely handy like I did. I am not kidding - this is THE quickest way to change any instrument in your track wherever you want to change it.
Happy FamiTracking, and I am looking forward to some more of your tunes.
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You now process Dracula's Rib. Good luck processing it...
