I recently purchased a serial Lcd with piezospeaker, which prompted me to download the corresponding product guide. I offer a few comments.
Page 4 of 11 and page 6 of 11: In the spin example, it should be waitcnt(clockfreq/10+cnt). The code shown delays only 10 msec.
Page 4 of 11: I would surely put a paragraph break before "The Line Feed..."
Page 5 of 11 and 6 of 11: That special character does not look at all like a diamond to me.
Page 6 of 11: In Playing Music, Dec 214 to 232 should be Dec 208 to 232.
Pages 7, 8, and 9 of 11: Extra header rows somehow crept into the table at more or less random places.
Missing: The ASCII character table is useful and would use the back side of the last page when printed double-sided (page 12).
Re-inventing the wheel is not a waste of time if, when you are done, you understand why it is round.