INTRANZ
====== Acoustic commands ======

Commands by horn or whistle 

^ Picture    ^ Description               ^ Meaning              ^
| ---------  | Constant tone             | Prepare (alarm)      |
| -          | 1 long tone               | Attack               |
| - -        | 2 long tones              | stand still          |
| - -        | 3 long tones              | Reverse              |
| # #        | 4 short tones             | Regroup              |
| - # -      | 1 long, 1 short, 1 long   | Gather               |
| # # -      | 2 short, 1 long, 2 short  | flanks on            |
| # # -      | 2 short + 1 long          | Fold up left flank   |
| - # #      | 1 long + 2 short          | Open right flank     |
| - #        | 1 long + 1 short          | Runner around right  |
| # -        | 1 short + 1 long          | Runner around left   |