bool length_changed = (note_events_.size () != fret_count);
vsize index;
- if (string_fret_finger != SCM_EOL)
+ if (!scm_is_null (string_fret_finger))
for (vsize i = 0; i < fret_count; i++)
{
note_entry = scm_list_ref (string_fret_finger, scm_from_int (i));
string_number = scm_car (note_entry);
- if (string_number != SCM_BOOL_F)
+ if (scm_is_true (string_number))
{
fret = scm_cadr (note_entry);
fret_label = scm_call_3 (fret_procedure,