if (!current_stepping_trackview) {
step_timeout = Glib::signal_timeout().connect (sigc::mem_fun(*this, &Editor::track_height_step_timeout), 500);
std::pair<TimeAxisView*, int> const p = trackview_by_y_position (event_coords.y);
if (!current_stepping_trackview) {
step_timeout = Glib::signal_timeout().connect (sigc::mem_fun(*this, &Editor::track_height_step_timeout), 500);
std::pair<TimeAxisView*, int> const p = trackview_by_y_position (event_coords.y);