void updateScreen() {
  
  u8g2.firstPage();
  do {
  //u8g2.clearBuffer();
  
  //BPM Tab
  if (displayTab == 0) { //BPM

    u8g2.setFont(velvetscreen);

    //Menu items
    if (masterClockMode == 0 && bpmModulationRange == 0) {
      lastMenuItem = 1;
    } else if (masterClockMode == 0 && bpmModulationRange != 0) {
      lastMenuItem = 2;
    } else if (masterClockMode == 1) {
      lastMenuItem = 0;
    }
    if (menuItem == 0 && insideTab) {
      u8g2.drawButtonUTF8(59, 6, U8G2_BTN_BW0|U8G2_BTN_INV, 20,  3,  2, "MODE:" );
    } else {
      u8g2.drawButtonUTF8(59, 6, U8G2_BTN_BW0, 20,  3,  2, "MODE:" );
    }
    if (masterClockMode == 0) {
      if (menuItem == 1) {
        u8g2.drawButtonUTF8(59, 16, U8G2_BTN_BW0|U8G2_BTN_INV, 20,  3,  2, "MODUL:" );
      } else {
        u8g2.drawButtonUTF8(59, 16, U8G2_BTN_BW0, 20,  3,  2, "MODUL:" );
      }
      if (bpmModulationRange != 0) {
        if (menuItem == 2) {
          u8g2.drawButtonUTF8(59, 26, U8G2_BTN_BW0|U8G2_BTN_INV, 20,  3,  2, "RANGE:" );
        } else {
          u8g2.drawButtonUTF8(59, 26, U8G2_BTN_BW0, 20,  3,  2, "RANGE:" );
        }
      }
    }
    //Values
    if (menuItem == 0 && insideTab && masterClockMode == 0) {
      u8g2.drawButtonUTF8(91, 6, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, "INT" );
    } else if ((menuItem != 0 || !insideTab) && masterClockMode == 0) {
      u8g2.drawButtonUTF8(91, 6, U8G2_BTN_BW0, 30,  4,  2, "INT" );
    } 
    if (menuItem == 0 && masterClockMode == 1) {
      u8g2.drawButtonUTF8(91, 6, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, "EXT" );
    } else if (menuItem != 0 && masterClockMode == 1) {
      u8g2.drawButtonUTF8(91, 6, U8G2_BTN_BW0, 30,  4,  2, "EXT" );
    }

    if (masterClockMode == 0) {
      if (menuItem == 1 && bpmModulationRange != 0 && bpmModulationChannel == 0) {
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, "CV1" );
      } else if (menuItem != 1 && bpmModulationRange != 0 && bpmModulationChannel == 0) {
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0, 30,  3,  2, "CV1" );
      }
      if (menuItem == 1 && bpmModulationRange != 0 && bpmModulationChannel == 1) {
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, "CV2" );
      } else if (menuItem != 1 && bpmModulationRange != 0 && bpmModulationChannel == 1){
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0, 30,  3,  2, "CV2" );
      }
      if (menuItem == 1 && bpmModulationRange == 0) {
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, "OFF" );
      } else if (menuItem != 1 && bpmModulationRange == 0)  {
        u8g2.drawButtonUTF8(91, 16, U8G2_BTN_BW0, 30,  4,  2, "OFF" );
      }
      String bpmModStr = String(bpmModulationRange * 10);
      char bpmModChar[3];
      bpmModStr.toCharArray(bpmModChar, 3);
      if (menuItem == 2 && bpmModulationRange != 0) {
        u8g2.drawButtonUTF8(91, 26, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  4,  2, bpmModChar );
      } else if (menuItem != 2 && bpmModulationRange != 0) {
        u8g2.drawButtonUTF8(91, 26, U8G2_BTN_BW0, 30,  4,  2, bpmModChar );
      }
    }

    String bpmStr = String(bpm);
    char bpmChar[5];
    bpmStr.toCharArray(bpmChar, 5);
    u8g2.setFont(u8g2_font_logisoso24_tn);
    if (!insideTab && shiftBtnPushed) {
      u8g2.drawButtonUTF8(28, 26, U8G2_BTN_BW1|U8G2_BTN_INV|U8G2_BTN_HCENTER, 56,  0,  0, bpmChar );
      u8g2.setFont(velvetscreen);
      u8g2.drawButtonUTF8(29, 40, U8G2_BTN_BW1|U8G2_BTN_HCENTER, 55,  0,  2, "BPM" );
    } else {
      u8g2.drawButtonUTF8(28, 26, U8G2_BTN_BW0|U8G2_BTN_HCENTER, 56,  0,  0, bpmChar );
      u8g2.setFont(velvetscreen);
      u8g2.drawButtonUTF8(29, 40, U8G2_BTN_BW0|U8G2_BTN_HCENTER, 55,  0,  2, "BPM" );
    }
  
  } 
  //Channel Tabs
  else {
    //Menu items
    lastMenuItem = 3;

    byte menuItemWidth = 32;
    if (menuItem == 0 && insideTab) {
      u8g2.drawButtonUTF8(2, 6, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "MODE:" );
    } else {
      u8g2.drawButtonUTF8(2, 6, U8G2_BTN_BW0, menuItemWidth,  2,  2, "MODE:" );
    }
    if (menuItem == 1 && insideTab && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "OFFSET:" );
    } else if ((menuItem != 1 || insideTab) && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0, menuItemWidth,  2,  2, "OFFSET:" );
    }
    if (menuItem == 1 && insideTab && channels[displayTab - 1].mode == 1) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "SUBDIV:" );
    } else if ((menuItem != 1 || insideTab) && channels[displayTab - 1].mode == 1) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0, menuItemWidth,  2,  2, "SUBDIV:" );
    }
    if (menuItem == 1 && insideTab && channels[displayTab - 1].mode == 2) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "EDIT" );
    } else if ((menuItem != 1 || insideTab) && channels[displayTab - 1].mode == 2) {
      u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0, menuItemWidth,  2,  2, "EDIT" );
    }
    if (menuItem == 2 && insideTab) {
      u8g2.drawButtonUTF8(2, 26, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "CV1:" );
    } else {
      u8g2.drawButtonUTF8(2, 26, U8G2_BTN_BW0, menuItemWidth,  2,  2, "CV1:" );
    }
    if (menuItem == 3 && insideTab) {
      u8g2.drawButtonUTF8(2, 36, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "CV2:" );
    } else {
      u8g2.drawButtonUTF8(2, 36, U8G2_BTN_BW0, menuItemWidth,  2,  2, "CV2:" );
    }

    String valueStr;
    char valueChar[8];

    //Values
    byte valueWidth = 28;
    if (menuItem == 0 && insideTab && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "CLOCK" );
    } else if ((menuItem != 0 || !insideTab) && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0, valueWidth,  3,  2, "CLOCK" );
    } else if (menuItem == 0 && insideTab && channels[displayTab - 1].mode == 1) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "RAND" );
    } else if ((menuItem != 0 || !insideTab) && channels[displayTab - 1].mode == 1) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0, valueWidth,  3,  2, "RAND" );
    } else if (menuItem == 0 && insideTab && channels[displayTab - 1].mode == 2) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "SEQ" );
    } else if ((menuItem != 0 || !insideTab) && channels[displayTab - 1].mode == 2) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 6, U8G2_BTN_BW0, valueWidth,  3,  2, "SEQ" );
    }

    if (channels[displayTab - 1].mode == 0) {
      valueStr = String(channels[displayTab - 1].offset) + "/";
      valueStr = valueStr + String(channelPulsesPerCycle[displayTab-1]+1);
    } else if (channels[displayTab - 1].mode == 1 && subDivs[channels[displayTab - 1].subDiv] > 0) {
      valueStr = "/" + String(subDivs[channels[displayTab - 1].subDiv]);
    } else if (channels[displayTab - 1].mode == 1 && subDivs[channels[displayTab - 1].subDiv] < 0) {
      valueStr = "x" + String(abs(subDivs[channels[displayTab - 1].subDiv]));
    }
    valueStr.toCharArray(valueChar, 8);

    if (menuItem == 1 && insideTab && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 16, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, valueChar );
    } else if ((menuItem != 1 || !insideTab) && channels[displayTab - 1].mode == 0) {
      u8g2.drawButtonUTF8(menuItemWidth+6, 16, U8G2_BTN_BW0, valueWidth,  3,  2, valueChar );
    }

    if (channels[displayTab - 1].mode == 0 && subDivs[channels[displayTab - 1].subDiv] > 0) {
      valueStr = "/" + String(subDivs[channels[displayTab - 1].subDiv]);
    } else if (channels[displayTab - 1].mode == 0 && subDivs[channels[displayTab - 1].subDiv] < 0) {
      valueStr = "x" + String(abs(subDivs[channels[displayTab - 1].subDiv]));
    } else if (channels[displayTab - 1].mode == 1) {
      valueStr = String(channels[displayTab - 1].random) + "0%";
    } else if (channels[displayTab - 1].mode == 2) {
      valueStr = "A" + String(channels[displayTab - 1].random + 1);
    }
    valueStr.toCharArray(valueChar, 8);

    u8g2.setFont(u8g2_font_logisoso24_tr);
    if (!insideTab && shiftBtnPushed) {
      u8g2.drawButtonUTF8(96, 26, U8G2_BTN_BW1|U8G2_BTN_INV|U8G2_BTN_HCENTER, 56,  0,  0, valueChar );
    } else {
      u8g2.drawButtonUTF8(96, 26, U8G2_BTN_BW0|U8G2_BTN_HCENTER, 56,  0,  0, valueChar );
    }

  }
  /*
  } else { //CHANNELS
    lastMenuItem = 3;
    if (menuItem == 0 && insideTab) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(62, 1);
    display.println(F("MODE:"));
    if (menuItem == 1) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(62, 13);
    if (channels[displayTab - 1].mode == 0) {
      display.println(F("OFT:"));
    } else if (channels[displayTab - 1].mode == 1) {
      display.println(F("RND:"));
    } else if (channels[displayTab - 1].mode == 2) {
      display.println(F("PAT:"));
    }
    if (menuItem == 2) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(62, 25);
    display.println(F("CV1:"));
    if (menuItem == 3) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(62, 37);
    display.println(F("CV2:"));
  }*/

 /*else { //CHANNELS
    if (menuItem == 0 && insideTab) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(94, 1);
    if (channels[displayTab - 1].mode == 0) {
      display.print(F("CLK"));
    } else if (channels[displayTab - 1].mode == 1) {
      display.print(F("RND"));
    } else if (channels[displayTab - 1].mode == 2) {
      display.print(F("SEQ"));
    }
    if (menuItem == 1) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(94, 13);
    if (channels[displayTab - 1].mode == 0) { //OFFSET
      display.print(channels[displayTab - 1].offset);
      display.print(F("/"));
      display.print(channelPulsesPerCycle[displayTab-1]+1);
      display.print(F(" "));
    } else if (channels[displayTab - 1].mode == 1) { //RANDOM
      display.print(channels[displayTab - 1].random);
      display.print(F("0% "));
    } else if (channels[displayTab - 1].mode == 2) { //SEQ
      display.print(channels[displayTab - 1].seqPattern + 1);
    }
    if (menuItem == 2) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(94, 25); 
    if (channels[displayTab - 1].CV1Target == 1) {
      display.print(F("DIV"));
      //display.print(channels[displayTab - 1].CV1Value);
    } else if (channels[displayTab - 1].CV1Target == 2) {
      display.print(F("RND"));
      //display.print(channels[displayTab - 1].CV1Value);
    } else if (channels[displayTab - 1].CV1Target == 3) {
      display.print(F("PAT"));
      //display.print(channels[displayTab - 1].CV1Value);
    } else {
      display.print(F("OFF "));
    }
    if (menuItem == 3) {
      display.setTextColor(SSD1306_BLACK);
    } else {
      display.setTextColor(SSD1306_WHITE);
    }
    display.setCursor(94, 37);
    if (channels[displayTab - 1].CV2Target == 1) {
      display.print(F("DIV"));
      //display.print(channels[displayTab - 1].CV2Value);
    } else if (channels[displayTab - 1].CV2Target == 2) {
      display.print(F("RND"));
      //display.print(channels[displayTab - 1].CV2Value);
    } else if (channels[displayTab - 1].CV2Target == 3) {
      display.print(F("PAT"));
      //display.print(channels[displayTab - 1].CV2Value);
    } else {
      display.print(F("OFF "));
    }
  }

  //Content
  display.setCursor(2, 2);
  display.setTextSize(3);
  if (!insideTab && shiftBtnPushed){
    display.fillRoundRect(0, 0, 58, 42, 5, SSD1306_WHITE);
    display.setTextColor(SSD1306_BLACK);
  } else {
    display.setTextColor(SSD1306_WHITE);
  }
  if (displayTab == 0 && masterClockMode == 0) {
    if (bpm < 100) {
      display.print(" ");
    }
    display.println(bpm);
    display.setCursor(19, 26);
    display.setTextSize(2);
    display.println(F("BPM"));
  } else if (displayTab == 0 && masterClockMode == 1) {
    display.println(F(" 24"));
    display.setCursor(8, 26);
    display.setTextSize(2);
    display.println(F("PPQN"));
  } else if (displayTab == 0 && masterClockMode == 2) {
    display.setCursor(8, 8);
    display.setTextSize(2);
    display.println(F("BEAT"));
  } else if (displayTab == 0 && masterClockMode == 3) {
    display.setCursor(8, 8);
    display.setTextSize(2);
    display.println(F("1/16"));
  } else {
    if (subDivs[channels[displayTab - 1].subDiv] == 0) {
      display.print(F("OFF"));
    } else if (subDivs[channels[displayTab - 1].subDiv] > 0) {
      display.print(F("/"));
      display.print(abs(subDivs[channels[displayTab - 1].subDiv]));
    } else {
      display.print(F("x"));
      display.print(abs(subDivs[channels[displayTab - 1].subDiv]));
    }
  }
  */

  //Tabs
  u8g2.drawHLine(0, 53, 128);
  u8g2.setFont(velvetscreen);
  byte yPos = 61;
  byte xWidth = 12;
  if (displayTab == 0) {
    if (insideTab == true || shiftBtnPushed == true) {
      u8g2.drawButtonUTF8(xWidth/2, yPos, U8G2_BTN_BW1|U8G2_BTN_HCENTER, xWidth-2,  0,  2, "w" );
    } else {
      u8g2.drawButtonUTF8(xWidth/2, yPos, U8G2_BTN_BW1|U8G2_BTN_INV|U8G2_BTN_HCENTER, xWidth-2,  0,  2, "w" );
    }
  } else {
    u8g2.drawButtonUTF8(xWidth/2, yPos, U8G2_BTN_BW0|U8G2_BTN_HCENTER, xWidth,  0,  2, "w" );
  }
  
  for (int i = 1; i <= 6; i++) {
    String tabNameStr = String(i);
    char tabNameChar[3];
    tabNameStr.toCharArray(tabNameChar, 3);
    if (displayTab == i) {
      if (insideTab == true || shiftBtnPushed == true) {
        u8g2.drawButtonUTF8(i*xWidth + xWidth/2, yPos, U8G2_BTN_BW1|U8G2_BTN_HCENTER, xWidth-2,  0,  2, tabNameChar);
      } else {
        u8g2.drawButtonUTF8(i*xWidth + xWidth/2, yPos, U8G2_BTN_BW1|U8G2_BTN_INV|U8G2_BTN_HCENTER, xWidth-2,  0,  2, tabNameChar);
      }
    } else {
      u8g2.drawButtonUTF8(i*xWidth + xWidth/2, yPos, U8G2_BTN_BW0|U8G2_BTN_HCENTER, xWidth,  0,  2, tabNameChar);
    }
  }

  //u8g2.sendBuffer();
  } while ( u8g2.nextPage() );
}