Stir together the cooked and drained ground beef, onion, carrots, celery, tomatoes, beans, broth, pasta sauce, oregano, hot pepper sauce, salt and pepper in a 6 to 7-quart slow cooker.Cover and cook on LOW for 5 to 7 hours, or until the vegetables are as tender as you like them.When ready to serve, stir the cooked pasta into the soup. Taste the soup and adjust the salt and herbs to suit your tastes.Serve with grated parmesan and a sprinkling of fresh parsley if desired.