Number: 6 (coarse) 38 (fine)
The value of some Registered or Non-Registered Parameter. Which parameter is affected depends upon a preceding RPN or NRPN message (which itself identifies the parameter's number).
On some devices, this slider may not be used in conjunction with RPN or NRPN messages. Instead the musician can set the slider to control a single parameter directly, often a parameter such as what Aftertouch can control.
If a MultiTimbral device, then each Part usually has its own RPN and NRPN settings, and Data Entry slider setting.
14-bit coarse/fine resolution. 0x0000 to 0x3FFF where 0 is minimum effect.