ck rate is divided by twice the
          period number for the pitch it will give the rate to send the
          data to the channel, eg. for a PAL machine sending a note at
          C2 (period 428), the rate is 7093789.2/856 ~= 8287.1369
(Each sample is stored sequentially)

Pattern Format:
Each pattern is divided into 64 divisions. By allocating different
tempos for each pattern and spacing the notes across different amounts
of divisions, different bar sizes can be accommodated.

Each division contains 