Notes

Plan

Test speaker without Arduino
can be done by using a function generator and 3.3V square wave with variable frequency
Write AVR C code to generate a square wave of varying frequency via Timer1
Timer1 is used so that a pre-scalar and its calculations don't need to be done
Use a table/array that stores frequencies and the indices correspond to the buttons on the sound board
Create buffers to add recording/saving/playing functionality
the buffers are a sequence of notes (which are the indices of the previous table) that is terminated by some other byte
Figure out how the LCD in the starter kit is programmed
Show the current and surrounding notes in the currently selected buffer (or the note of the soundboard button that was just pressed)
Add a menu on the second row to select the memory buffer (maybe 1-5)
it is controlled by left and right buttons

the speaker was tested with a function generator (from the EspoTek Labrador) outputting a square wave of varying frequency
it is painful above a frequency of 12 kHz and just creates clicks below 30 Hz
it is louder at certain frequencies and quieter at others, and this is not a linear relationship
the speaker's datasheet has a graph of this which can be used to adjust the speaker's volume at the problematic frequencies