Can't hear playback for multiple audio tracks

Hi there!,
So I was mixing several audio tracks (6) with fade ins/outs and had locked them down. I had saved my project and the next time I opened it - only my first track played while the rest of the tracks didn't. The other audio tracks on the other hand do show volume levels and that it is "playing" in the meter - but no audio. How can I get them all to play?
I know it's not an overload problem (playhead is white) I've recently unlocked the tracks and changed my preferences to "minimun delay when playing instruments live" but - I still can't get them all to play. . .if you could please help, I'd appreciate it! ::smiles::

nevermind! it was the DUCKING feature. . . Control>Ducking

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