Open ADI-2 Control 0.2.1

Fixed

• ADI-2/4 Pro SE: Line Out Ref Level has five values (+1, +7, +13, +19, +24 dBu). 0.2.0 and
  earlier used the ADI-2 Pro's four (+4, +13, +19, +24 dBu), so the level was shown and set one
  step off. The order is taken as ascending, like the SE's input list in RME's table; not yet
  checked on an SE.
• open-adi2-control get line ref printed a phones level name instead of the line level.

Changed

• Device ID 0x73 is shown as "ADI-2/4 Pro SE / Pro EX" (the ADI-2/4 Pro EX is expected to use the
  SE's ID).
• A select value the unit reports that RME's MIDI table doesn't list (for example settings the
  ADI-2/4 Pro EX added) is shown as #n instead of (n) or an empty field; the command line
  prints it as #n and accepts #n for set.