Here's a more detailed breakdown of the sound:
* The first note is usually a low C. This is the starting point of the call.
* The call then ascends in a series of four notes. These are played quickly and with a distinct upward direction.
* The final note is usually a high G. This is the highest note in the call and gives it a sense of completion.
You can listen to recordings of reveille online to get a better understanding of how it sounds.
Here's an example:
[https://www.youtube.com/watch?v=K34r5j6mO2o](https://www.youtube.com/watch?v=K34r5j6mO2o)