The possible combinations and resulting shapes are:
Here is the information transformed into a wiki table format: {| class="wikitable"|-! Binary !! Hex !! Shape!! Comment |-| 00XX || 00h-03h || <code>\_________ (</code> || same as 09h) |-| 01XX || 04h-07h || <code>/_________ (</code> || same as 0Fh) |-| 1000 || 08h || <code>\\\\\\\\\\</code> || |-| 1001 || 09h || <code>\_________ (</code> || volume remains quiet) |-| 1010 || 0Ah || <code>\/\/\/\/\/</code> || |- | 1011 || 0Bh || <code>\""""""""" (</code> || volume remains high) |-| 1100 || 0Ch || <code>//////////</code> || |- | 1101 || 0Dh || <code>/""""""""" (</code> || volume remains high) |-| 1110 || 0Eh || <code>/\/\/\/\/\</code> || |-| 1111 || 0Fh || <code>/_________ (</code> || volume remains quiet)|}
We can observe that there are only 8 resulting shapes even though they are selected by using a 4-bit value.