Mixer *master_mixer = 0;
for( int i=0, n=edl->mixers.size(); i<n; ++i ) {
if( master_track->index_in(edl->mixers[i]) >= 0 ) {
Mixer *master_mixer = 0;
for( int i=0, n=edl->mixers.size(); i<n; ++i ) {
if( master_track->index_in(edl->mixers[i]) >= 0 ) {