I've just bought a sony walkman

nwd-b103f.
This walkman doesn't do gapless playback. I am finding a way to eliminate the gap between tracks. So far the only idea I have is to manually edit the sound files to end earlier by cutting their silent endings.
I have alot of tracks, 25 to edit this way. Any1 has an idea of how to solve this without going through them 1 by 1?