[ddots-l] MIDI HELP

hello, I'm new to midi so please be pashont with me.  I've recorded my first 
track and I want to add more to the song but when I change instruments the
first track chages to the new instrument sound.  I am chaging instrument sounds 
on the keyboard itself.  Am I not supposed to change sounds this way? 
Do I have to change something in sonar before chaing instruments?  Can someone 
please help me I'm at a loss!
Thanks
Chad

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