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Line6 Helix Looper Function Controller


Line6 Helix Looper Controller


This is a design for a 5-button footswitch that will control some of the Looper functions on a Line6 Helix unit. These each respond to a particular MIDI Control Change (CC) message. The 5 footswitch inputs are:

1 - record - CC60, value 64,
2 - overdub - CC60, value 0,
3 - undo - CC63, value 64,
4 - forward/reverse - CC65, alternating value 0 or 64 on successive presses,
5 - full/half speed - CC66, alternating value 0 or 64 on successive presses.




*Click to Enlarge*


Line6 Helix Looper Controller


PRICE:  €50.00



The Line6 Helix Looper Controller unit utilizes:

  • An assembled, built and tested Arduino board including a suitable pre-programmed microcontroller,
  • A 2.1mm power socket, and associated LED, 
  • A MIDI detection LED,
  • A 4-way DIP switch, which selects the MIDI channel at power-on, shown in table 1
  • A 150mm wired MIDI 5-pin DIN input socket,
  • A 150mm wired MIDI 5-pin DIN output socket, 



The Line6 Helix Looper Controller requires:

  • A 9 Volt battery or equivalent 9 Volt DC external power source, or USB Connector,
  • 5 momentary action foot-switches.






     *Click to Enlarge*

The MIDI IN and OUT connectors use  5-Pin 180 degree DIN sockets. Note that the MIDI IN/OUT wiring is polarised and the correct pins should be used.




Circuit Diagrams:

The switches circuit schematic is available,

The MIDI IN/OUT circuit schematic is available, 

and the Arduino Uno schematic diagram is also available.


Power Supply:

The  Arduino can be powered via the USB connection or with an external power supply. 


External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. A low dropout regulator provides improved energy efficiency.


The board can operate on an external supply of 7 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.


MIDI Specification: 

The MIDI Channel (1 to 16) of the Line6 Helix Looper Controller unit can be selected using the 4-way DIP switch selector shown in Table below. The system will also work with MIDI running status.



DIP Switch Selections



4 3 2 1
on on on on 1
on on on off 2
on  on  off on 3
on on off off 4
on off on on 5
on off on off 6
on off off on 7
on off off off 8
off on on on 9
off on on off 10
off on  off on 11
off on off off 12
off off on on 13
off off on off 14
off off off on 15
off off off off 16

Table 1 MIDI Channel