Ok I'm trying to overdub over myself using Reaper.

I record the first track fine.

I then set up the second track and begin to record. The first track plays...

...and the second track records it.

It's not a mic picking it up as I'm using a simple 1/4'' to 1/8'' adaptor input (albeit it with 2 1/4'' inputs). Even if I use headphones it records it.

Is there anyway round this? I've tried using the second 1/4'' input too and changing the input selected and it still picks up the first track.

Any help appreciated.