Justin Thomas

hi my previously added vst tracks not responding to my midi keyboard. can any one help?

Hi i was working on a project and it seems my previously added VST instruments not responding to my midi keyboard any more. the previously recorded notes are still playing but i can't play anything new on that track.  i tried adding new tracks and they are working fine. can any one help me with it? right now my 1st 9 tracks are not responding.