{
ARDOUR::BundleChannel const px = position_to_channel (x, y, _matrix->visible_columns());
ARDOUR::BundleChannel const py = position_to_channel (y, x, _matrix->visible_rows());
{
ARDOUR::BundleChannel const px = position_to_channel (x, y, _matrix->visible_columns());
ARDOUR::BundleChannel const py = position_to_channel (y, x, _matrix->visible_rows());