Bc2000 (for the BCF2000 & BCR2000)

Hi, continuing to try to set up a Yamaha AN200 preset using Sysex codes.  I have an encoder controlling LFO Wave type as follows:

$encoder 33 ;LFO1 Wave
  .showvalue on
  .mode 1dot
  .resolution 96 96 96 96
  .default 0
  .minmax 0 20
  .tx $F0 $43 $10 $5C $10 $10 $09 val $F7 ;LFO1 Wave

But when I try to use a button instead, it appears that nothing happens (no output on the BCR display and no Sysex output). The button code is:

$button 33 ;LFO Wave
  .showvalue on
  .default 0
  .mode down
  .minmax 0 20
  .tx $F0 $43 $10 $5C $10 $10 $09 val $F7 ;LFO1 Wave

I have tried all 4 modes and still have no result.  Any suggestions what I might be doing wrong? Or can anyone point me to working examples of button Sysex codes?

Thanks

Bill