A friend of mine and I were recording a song using his 4 track recorder. We recorded 3 tracks: rhythm guitar, bass, lead guitar. When we listen to the song on the 4 track, we can hear all 3 tracks but when played in a common everyday cassette player (we tried a few) you can only hear the rhythm guitar and bass, the lead guitar can't be heard. Anyone know what the problem is and how to fix it? We're totally new to DIY recording.