Flickering Potentiometer

If you don't drive the address lines of those muxes, they're in an undefined state. Add an AnalogMultiplex object and use its pins.

[b][color=#d35400]AnalogMultiplex[/color][/b] [color=#000000]multiplexer[/color][color=#000000]([/color][color=#00979c]A0[/color][color=#434f54],[/color] [color=#000000]{[/color] [color=#000000]2[/color][color=#434f54],[/color] [color=#000000]3[/color][color=#434f54],[/color] [color=#000000]4[/color][color=#434f54],[/color] [color=#000000]5[/color] [color=#000000]}[/color] [color=#000000])[/color][color=#000000];[/color]

[b][color=#d35400]Analog[/color][/b] [color=#000000]potentiometers[/color][color=#000000][[/color][color=#000000]][/color] [color=#434f54]=[/color] [color=#000000]{[/color]
  [color=#000000]{[/color][color=#000000]multiplexer[/color][color=#434f54].[/color][color=#d35400]pin[/color][color=#000000]([/color][color=#000000]0[/color][color=#000000])[/color][color=#434f54],[/color] [b][color=#d35400]MIDI_CC[/color][/b][color=#434f54]:[/color][color=#434f54]:[/color][color=#00979c]Channel_Volume[/color][color=#434f54],[/color] [color=#000000]1[/color][color=#000000]}[/color][color=#434f54],[/color]
  [color=#000000]{[/color][color=#000000]multiplexer[/color][color=#434f54].[/color][color=#d35400]pin[/color][color=#000000]([/color][color=#000000]1[/color][color=#000000])[/color][color=#434f54],[/color] [b][color=#d35400]MIDI_CC[/color][/b][color=#434f54]:[/color][color=#434f54]:[/color][color=#00979c]Channel_Volume[/color][color=#434f54],[/color] [color=#000000]2[/color][color=#000000]}[/color][color=#434f54],[/color]
  [color=#000000]{[/color][color=#000000]multiplexer[/color][color=#434f54].[/color][color=#d35400]pin[/color][color=#000000]([/color][color=#000000]2[/color][color=#000000])[/color][color=#434f54],[/color] [b][color=#d35400]MIDI_CC[/color][/b][color=#434f54]:[/color][color=#434f54]:[/color][color=#00979c]Channel_Volume[/color][color=#434f54],[/color] [color=#000000]3[/color][color=#000000]}[/color][color=#434f54],[/color]
  [color=#000000]{[/color][color=#000000]multiplexer[/color][color=#434f54].[/color][color=#d35400]pin[/color][color=#000000]([/color][color=#000000]3[/color][color=#000000])[/color][color=#434f54],[/color] [b][color=#d35400]MIDI_CC[/color][/b][color=#434f54]:[/color][color=#434f54]:[/color][color=#00979c]Channel_Volume[/color][color=#434f54],[/color] [color=#000000]4[/color][color=#000000]}[/color][color=#434f54],[/color]
[color=#000000]}[/color][color=#000000];[/color]