void updateScreen() {
  
  u8g2.firstPage();
  do {

    if (displayScreen == 0) {
      //BPM Tab
      if (displayTab == 0) { //BPM

        u8g2.setFont(velvetscreen);

        //Menu items
        byte menuItemWidth = 32;
        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(62, 6, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "MODE:" );
        } else {
          u8g2.drawButtonUTF8(62, 6, U8G2_BTN_BW0, menuItemWidth,  2,  2, "MODE:" );
        }
        if (masterClockMode == 0) {
          if (menuItem == 1) {
            u8g2.drawButtonUTF8(62, 16, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "MOD:" );
          } else {
            u8g2.drawButtonUTF8(62, 16, U8G2_BTN_BW0, menuItemWidth,  2,  2, "MOD:" );
          }
          if (bpmModulationRange != 0) {
            if (menuItem == 2) {
              u8g2.drawButtonUTF8(62, 26, U8G2_BTN_BW0|U8G2_BTN_INV, menuItemWidth,  2,  2, "RANGE:" );
            } else {
              u8g2.drawButtonUTF8(62, 26, U8G2_BTN_BW0, menuItemWidth,  2,  2, "RANGE:" );
            }
          }
        }
        //Values
        byte valueWidth = 28;
        if (menuItem == 0 && insideTab && masterClockMode == 0) {
          u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 6, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "INT" );
        } else if ((menuItem != 0 || !insideTab) && masterClockMode == 0) {
          u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 6, U8G2_BTN_BW0, valueWidth,  2,  2, "INT" );
        } 
        if (menuItem == 0 && masterClockMode == 1) {
          u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 6, U8G2_BTN_BW0|U8G2_BTN_INV, 30,  2,  2, "EXT" );
        } else if (menuItem != 0 && masterClockMode == 1) {
          u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 6, U8G2_BTN_BW0, valueWidth,  2,  2, "EXT" );
        }

        if (masterClockMode == 0) {
          if (menuItem == 1 && bpmModulationRange != 0 && bpmModulationChannel == 0) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "CV1" );
          } else if (menuItem != 1 && bpmModulationRange != 0 && bpmModulationChannel == 0) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0, valueWidth,  3,  2, "CV1" );
          }
          if (menuItem == 1 && bpmModulationRange != 0 && bpmModulationChannel == 1) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "CV2" );
          } else if (menuItem != 1 && bpmModulationRange != 0 && bpmModulationChannel == 1){
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0, valueWidth,  2,  2, "CV2" );
          }
          if (menuItem == 1 && bpmModulationRange == 0) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "OFF" );
          } else if (menuItem != 1 && bpmModulationRange == 0)  {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 16, U8G2_BTN_BW0, valueWidth,  2,  2, "OFF" );
          }
          String bpmModStr = String(bpmModulationRange * 10);
          char bpmModChar[3];
          bpmModStr.toCharArray(bpmModChar, 3);
          if (menuItem == 2 && bpmModulationRange != 0) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 26, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  4,  2, bpmModChar );
          } else if (menuItem != 2 && bpmModulationRange != 0) {
            u8g2.drawButtonUTF8(62 + menuItemWidth + 4, 26, U8G2_BTN_BW0, valueWidth,  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 PATTERN" );
        } else if ((menuItem != 1 || insideTab) && channels[displayTab - 1].mode == 2) {
          u8g2.drawButtonUTF8(2, 16, U8G2_BTN_BW0, menuItemWidth,  2,  2, "EDIT PATTERN" );
        }
        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" );
        }

        //SubDiv and offset
        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 != 2) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 16, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, valueChar );
        } else if ((menuItem != 1 || !insideTab)) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 16, U8G2_BTN_BW0, valueWidth,  3,  2, valueChar );
        }

        //CV1
        if (menuItem == 2 && insideTab && channels[displayTab - 1].CV1Target == 1) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "SUBDIV" );
        } else if ((menuItem != 2 || !insideTab) && channels[displayTab - 1].CV1Target == 1) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0, valueWidth,  2,  2, "SUBDIV" );
        } else if (menuItem == 2 && insideTab && channels[displayTab - 1].CV1Target == 2) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "RAND" );
        } else if ((menuItem != 2 || !insideTab) && channels[displayTab - 1].CV1Target == 2) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0, valueWidth,  2,  2, "RAND" );
        } else if (menuItem == 2 && !insideTab && channels[displayTab - 1].CV1Target == 3) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "PATT" );
        } else if ((menuItem != 2 || !insideTab) && channels[displayTab - 1].CV1Target == 3) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0, valueWidth,  2,  2, "PATT" );
        } else if (menuItem == 2 && insideTab && channels[displayTab - 1].CV1Target == 0) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "OFF" );
        } else if ((menuItem != 2 || !insideTab) && channels[displayTab - 1].CV1Target == 0) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 26, U8G2_BTN_BW0, valueWidth,  2,  2, "OFF" );
        }

        //CV2
        if (menuItem == 3 && insideTab && channels[displayTab - 1].CV2Target == 1) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "SUBDIV" );
        } else if ((menuItem != 3 || !insideTab) && channels[displayTab - 1].CV2Target == 1) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0, valueWidth,  2,  2, "SUBDIV" );
        } else if (menuItem == 3 && insideTab && channels[displayTab - 1].CV2Target == 2) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "RANDOM" );
        } else if ((menuItem != 3 || !insideTab) && channels[displayTab - 1].CV2Target == 2) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0, valueWidth,  2,  2, "RANDOM" );
        } else if (menuItem == 3 && !insideTab && channels[displayTab - 1].CV2Target == 3) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "PATTERN" );
        } else if ((menuItem != 3 || !insideTab) && channels[displayTab - 1].CV2Target == 3) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0, valueWidth,  2,  2, "PATTERN" );
        } else if (menuItem == 3 && insideTab && channels[displayTab - 1].CV2Target == 0) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0|U8G2_BTN_INV, valueWidth,  2,  2, "OFF" );
        } else if ((menuItem != 3 || !insideTab) && channels[displayTab - 1].CV2Target == 0) {
          u8g2.drawButtonUTF8(menuItemWidth+6, 36, U8G2_BTN_BW0, valueWidth,  2,  2, "OFF" );
        }

        //Main Param
        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 && channels[displayTab - 1].seqPattern < 8) {
          valueStr = "A" + String(channels[displayTab - 1].seqPattern + 1);
        } else if (channels[displayTab - 1].mode == 2 && channels[displayTab - 1].seqPattern >= 8) {
          valueStr = "B" + String(channels[displayTab - 1].seqPattern - 7);
        }
        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 );
        }

      }

      //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);
        }
      }

      if (!isPlaying) {
        u8g2.drawUTF8(121, yPos, "t");
      } else {
        u8g2.drawUTF8(122, yPos, "r");
      }
    }

  } while ( u8g2.nextPage() );
}