Parameter 2: 18

 => 'NRPN 1 MSB'
the term MSB refers to the fact that the value from the dial is send with the MSB controller '06'

Bx 63 nn  
Bx 62 NN
Bx 06 VV

x: channel (see parameter 1),

nn: NRPN-Adress MSB fixed to '01'
NN: NRPN-Adress LSB   (see parameter 3)
VV MSB value from Dial

Example: 

B0 63 01 B0 62 08 B0 06 22  
(same with running status: B0 63 01 62 08 06 22  )

( NRPN Vibrato Rate  - on channel 1 MSB Value 22 )

Parameter 3  ( NN )

Meaning of
NRPN (non registered parameters) depends on each manufacturer 
is often used for XG_Multi or GS