BS2-midi.md

Work in progress...

Ranges

osc
    range   16'=00111111     63
             8'=01000000     64             
             4'=01000001     65
             2'=01000010     66
                          
    fine    min=00011011     27
            max=11100100    228
               
    coarse  min=00000000      0
            max=11111111    127
            
    w.form  sin=00            0
            tri=01            1
            saw=10            2
            pul=11            3
            
    pul.wi. min=0000000       0
            max=1111111     127

Two-bytes values

Example with value = 23

23 / 2 --> 11
23 % 2 --> 1 --> 64

MSB: 11 in binary = 00001011
LSB: 64 in binary = 01000000

shift MSB one bit to left and add LSB bit:

    00010110
  + 00000001
  ----------
    00010111
   
binary 00010111 = decimal 23        

Example with value = 231

231 / 2 --> 115
231 % 2 --> 1 --> 64

MSB: 115 in binary = 01110011
LSB:  64 in binary = 01000000

shift MSB one bit to left and add LSB bit:

    11100110
  + 00000001
  ----------
    11100111
   
binary 11100111 = decimal 231       

Sysex

Values across bytes

Example with Osc1 LFO1 Depth:

mask:   00011111 01110000

-127:   xxx00000 x000xxxx   00000 000 = 0         0 - 127 = -127
 -56:   xxx01000 x111xxxx   01000 111 = 71       71 - 127 = -56
  -1:   xxx01111 x110xxxx   01111 110 = 126     126 - 127 = -1 
   0:   xxx10000 x000xxxx   10000 000 = 128     128 - 128 = 0
   1:   xxx10000 x001xxxx   10000 001 = 129     129 - 128 = 1 
  56:   xxx10111 x000xxxx   10111 000 = 184     184 - 128 = 56
 127:   xxx11111 x111xxxx   11111 111 = 255     255 - 128 = 127

 rule: if msb==1 substract 128 else substract 127