transpose pitch

Hello everyone, I just got a baritone guitar, tuned a 4th below standard (BEADF#B). I want to duplicate my current tunes in standard tuning and transpose only the pitch/playback, leaving the written chords intact... I'm going nuts trying different combinations of SET a SET AND TRANSPOSE, but...

I have both a Bb and a Eb instrument (tenor & alto saxes). Sometimes i only have one with me (say, the Bb one) and want to practice in the other instrument's key (the Eb one) .. So i want to see the Eb version chart and play on the Eb chart, but with my Bb instrument, so i need to lower (or...