Add the ability to select notification sounds from the OS/custom ones for event reminders, task alarms, etc rather than just the Opus One provided sounds. Eg I have spoken words saved as ring tones on my Apple devices and set as notifications for these alerts and reminders as it can be very confusing with just a sound alert as to what each sound is notifying you about. You can’t always check your phone/iPad immediately after an alert sounds but eg a spoken “event reminder” can be remembered.