You only get two effective tracks using an echo in most situations, because the third track is a delayed copy of one of the others in order to make an echo.
[Image: http://s11.postimg.org/vugrg83r7/mml.png]
[code]MML@l32<f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&f&ft100v15b4>c8g4f+8e4ef+ede4.c-4c8g4f+8e4ef+edl8ef+gd2.r>b+bgdc<bagdcc-cdegabc-4cg4f+e4l32ef+ede4.c-4c8g4f+8e4ef+edl8ef+ga4.b1r>>dc<bagf+ef+e<<def+v9<d+4g>d<a+gd+4g>d<a+gd+4g>d<a+gv15l16>>d+dd+fgaa+aa+>cdd+v9l8o2da>dd+d<ada>dd+d<ada>dd+d<ada>dl16cc+dd+ff+<d+4l8g>d<a+gd+4g>d<a+gd+4g>d<a+gv15l16>>d+dd+fgaa+aa+>cdd+df+df+df+cf+cf+cf+n58f+n58f+n58f+<an66an66an66g>d<g>d<g>dn54dn54dn54d<e>d<e>d<e>d<f+4.,r1r8.v10c-c8gf+8el32ef+ede4.c-4c8g4f+8e4ef+edl8ef+gd2.r>b+bgdc<bagdcc-cdegabc-4cg4f+e4l32ef+ede4.c-4c8g4f+8e4ef+edl8ef+ga4.b1r>>dc<bagf+ef+e<<def+l4.g>dcf4e16d+16dgl16d+dd+fgaa+aa+>cdd+l4.dc<af+4d+8dc<al16cc+dd+ff+l4.g>dcf4e16d+16dgl16d+dd+fgaa+aa+l8<<ddddddddddddddddddd4.>d2,r1v10<cg8>d.<cg8>e.<cg8>d.<cl8g>cde<<g4>dl4a.<g>d8b.<g>d8a.<g>d8b.cg8>d.<cg8>e.<cg8>d.<cl8g>cde<<g4>dl4a.<g>d8b.<g>d8a.<g>d8l4.bv15g>dcfdgv9<<d+4g8>d8<a+8g8v15o5dc<af+4d+8dc<ad+8d8<a8>g>dcfdgv10<<d+4l8g>d<a+g;[/code]