Why is it that sound from other tracks is making its way into new tracks I lay down in a session when I overdub. I recorded keys in track 1 and then when I recorded another set of keys in track 2 you can faintly hear track 1's keys in the background. What am I doing wrong? And also...since I really am pleased with what I recorded already, is there any way to eliminate the lower frequency somehow and get rid of this? Thanks in advance.