LITTLE-SCALE SN76489 USB MIDI (Page 4 of 4)

byte p_pitch;
byte p_channel;

then in the function : void doNoteon ()
add:
p_pitch = pitch;
p_channel = channel;
each time there is a check for velocity >0

then in : void doNoteOff()

if(pitch == p_pitch)   // avoid note cuts
        {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
        }
        else if((pitch != p_pitch) && (channel != p_channel))
        {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
        }

then in in the function : void doMidiIn ()
//note on

Line : else if((data < 0x80) && (flag_previous == 1))
add , p_pitch = data;

Line :if((data >= 0x90) && (data < 0xa0) && (flag_previous == 0))
add, p_channel =channel; 

this will keep track of the previous note played when there is a note off message next

//note off
else if((data < 0x80) && (flag_previous == -2)) 
    {
      velocity = data;
      
    if(pitch == previous_pitch)  // only if previous pitch is the same!...to avoid note cuts
      {
          doNoteOff(channel, pitch, velocity);
      }

      else if((pitch != p_pitch) && (channel != p_channel)) // if pitch is not the same BUT from another channel
      {
            velocityData[channel + (chip_select * 4)] = 0;
            writeAmplitude(0, channel, chip_select);
      }
      flag_previous = 0;
    }