I have a Tascam 388, a Marantz cassette 4-track and a Fostex model 80 that I use with a Tascam M520. When I record to tape on any of these sources, I love the sound quality. Its 3 dimensional and sounds exactly like I want. However, on occasion when I route the the recorded material into my computer for editing or mastering or whatever, it loses that 3D quality. Is it because Im going from unbalanced outs to balanced in? Is it my interface (Tascam 1800)? My computer soundcard (early 2011 macbook pro)? Any other suggestions? Thanks!