How to change the sound of notification reminders?

[Android Central Question]

I have set notification reminders for the message app to remind me of unchecked notifications every minute. I have changed the sound of message notifications both in general sounds and new message sounds so that when I originally get the notification is plays an air horn sound. But when it reminds me it plays a pitiful sound that defeats the purpose of the reminder. How do I change the reminder sound on the message app so that it plays the same sound as the original notification?