- SCM proc = ly_lily_module_constant ("midi-program");
- SCM program = scm_call_1 (proc, ly_symbol2scm (audio_->str_.c_str ()));
- found = (program != SCM_BOOL_F);
+ SCM program = Lily::midi_program (ly_symbol2scm (audio_->str_.c_str ()));
+ found = (scm_is_true (program));