Control Line 6 POD2 With MIDI using an ATTiny85

//Arduino IDE Code for sending up/down MIDI signals to a Line 6 POD 2.0 with an ATTiny85
//tested but offered 'as is' without support

#include <SoftwareSerial.h> //Microcontroller is an ATiny85 so using the SoftwareSerial library

SoftwareSerial mySerial(2,3); //RX =2, TX = ATTiny85 pin 2, PB3; MIDI transmit pin
byte status_byte = B11000000; //Status number 192 for program\bank change, hex = C0
byte count_val = 38;  // Set a start variable at 38 to avoid 'rollover' error when moving down\up patches

// MIDI send function
void send_byte(byte value) {
byte patch_value = value % 37; // Set patch_value= 0 to 36 (0 is manual)
// Re: Rollover, Byte type is unsigned, Binary 0 minus 1 is B11111111(255), and 255 mod 37 is 33. Hence the following count value reset
if(patch_value == 1) count_val = 38; //reset count_val to avoid rollover error
mySerial.write(status_byte); //send status byte
mySerial.write(patch_value);   //send patch value byte
delay(500); //wait (simple debounce and pause)
}

void setup() {
DDRB = B00001000; //Set PortB direction, in on PB0 and PB1 out on PB3
PORTB = B00000011; //Switch on internal pull up resistors
mySerial.begin(31250); //set MIDI baud rate (NB: Microcontroller fuses set to 8Mhz internal clock)
send_byte(count_val); //Send an initial start value, = Patch A1
}

void loop() {
byte  readpins = PINB | B11111100; //read pins once per loop, unpressed switch with pullups = 1 so bitmask applied to unused bits will always TRUE
  if (~readpins){                  //Switches have pull-ups, ~readpins will return TRUE when one is pushed
byte switch_val=~readpins; //inverse of inputs

switch (switch_val) {
    case B01: //Switch PB0 on
      {count_val-- ;
       send_byte(count_val);}
      break;
    case B10: //Switch PB1 on
       {count_val++ ;
       send_byte(count_val);}
      break;
}}}