"AAAAND it's gone" (synth track) [Solved]

SOLVED Sonar7: My synth is still there in the synth rack, my midi track is there as well but somehow the synth track in the arrange view is gone. I already looked in the Track Manager but it is not there. As a result I do not get any sound. There is another synth track corresponding to my midi track but somehow that one does not give me sound.