The Roland JV 1010 has two bytes to indicate a Bank number.  These are labelled MSB and LSB.  The MSB represents the "Most Significant Byte" and the LSB indicates the "Least Significant Byte."  Cakewalk Sonar 2.0XL only inputs a single Bank number, thus to control the Roland JV-1010 with Cakewalk Sonar 2.0XL the following conversion should take place:

If the MSB is 80 and LSB is 0, the Bank number will be: 20480

80 represented in binary is 0101 0000.  So place the MSB as the left-most byte in a two-byte field, place the LSB in the right-most byte.  Thus we get

0101 0000 0000 0000 which in decimal equals 20480

Just for fun, if the MSB was 84 and the LSB was 1, the Bank number will be: 21505

The binary would be: 0101 0100 0000 0001