I'm going from memory here, but i think a possible problem is that 1&2 should not be in the tape position. Off is one of the other choices on the 414 right, or mic/line on the 414 mkII? depending on how you have them panned, having 1&2 in tape position would bounce them into 3, but not the other way around. Hmmm
Also, is it truly bleeding onto those tracks or are you not monitoring properly? When you're overdubbing, you should have the effect2/tape cue switch in cue position and the button depressed,(all the others should be in the up position), then you control the amount of each signal with its corresponding pot on the channel strip. In mixdown mode, depress the L-r button (Again all others up) set all channels to tape position and adjust the levels with the faders, pan, eq, etc.
Hope I'm making sense, and have been of some help. Any real 414 owners wanna field this one?-lzb
Also, is it truly bleeding onto those tracks or are you not monitoring properly? When you're overdubbing, you should have the effect2/tape cue switch in cue position and the button depressed,(all the others should be in the up position), then you control the amount of each signal with its corresponding pot on the channel strip. In mixdown mode, depress the L-r button (Again all others up) set all channels to tape position and adjust the levels with the faders, pan, eq, etc.
Hope I'm making sense, and have been of some help. Any real 414 owners wanna field this one?-lzb