OneButton

It is portable guitar processor, based on Guitarix, Jackd and Linux.

BoneButton	TankButton
	na

Main idea

DIY opensource guitar processor with one button, simple display and infinity ways for customization.

One footswitch can control each element in your stompbox, simple config for ex:

Init (switch to Rythm preset & display "R" letter) --> Click (switch to Solo preset & show "Skull" animation) --> Click (goto Init)
Init (Tuner off) --> Longpush (Tuner on & Mute output) --> Longpush (goto Init)

If you'd like to use additional buttons - just connect it (GPIO, USB, etc) and change hw configuration of pedal.

And any action can be used as a part of step in this live graph:

• Enable looper rec
• Change effect value
• Switch graph for click/longpush
• Go to specific graph position or back
• Any custom action that you can imagine!

About display: to show some info about current state you can use number of options:

• Led line with > 2 leds
• Led matrix
• Text display
• Graphical display
• Etc...

Managing presets is carried out using Guitarix GUI interface or WEB interface.

Additional features

• Flexible audio mapping - you can control multiple audio interfaces and manage effects for a number of instruments
• Delayed actions - click and run sequence of actions with controllable delays
• Switch presets without pause and clicking
• No cut-off when swiching presets (for ex. delay & reverb processing last output)

Target platform

It is possible to run on any linux distributive, but current target platform is Ubuntu 16.04.

Reference hardware

Right now I use the following hardware:

• Platform:
  • ODROID-C2
    • CPU: 4x 2GHz 64bit
    • RAM: 2GB
    • eMMC + MicroSD
    • 4x USB + OTG
• Audio:
  • ESI UGM96
  • ESI Maya22
• USB Bluetooth 4.0 dongle
• Rainbowduino 8x8 RGB led matrix
• Momentary soft-touch footswitch
• 3D printed case

But, you can ignore that, because RaspberryPI & any usb card with high-z input and line out can do the same thing.

Also GPIO is not required - just write small plugin python script and use any USB/UART/(interface)-driven buttons or controller for input/output interfaces.

Not recommended

• Platforms:
  • ODROID-C1+ - buggy USB (but OTG ok) can cause kernel freezes
    • CPU: 4x 1.5GHz 32bit
    • RAM: 1GB
    • eMMC + MicroSD
    • 4x USB + OTG

Installation

• Clone onebutton repo
• Install guitarix & made some changes from setup.sh
• Prepare your system to use realtime settings: http://github.com/raboof/realtimeconfigquickscan
• Change config.yaml to suit your HW configuration
• Go to plugins directory and build required plugins
• Run ./onebutton config.yaml and check logs that everything fine
• Rock & Roll!
• Optional: copy init script (upstart.conf, systemd.service) to run onebutton on system start

Bluetooth

You can manage your onebutton by using the OneControl application, but make sure that you're use bluez>=5.40 - dbus bluez profiles working properly with it. OneControl you can find here: http://github.com/rabits/onecontrol

Guitarix WEB UI

To manage Guitarix OneButton support webui interface, that placed in guitarix-webui folder. It will be used after Guitarix startup.

TODO

• Platforms:
  • Banana Pi M3
    • CPU: 8x 1.8GHz
    • RAM: 2GB
    • 2 USB + OTG
    • SATA + int eMMC 8Gb + MicroSD
    • WiFi(n)
    • Bluetooth(4.0)
  • Banana Pi M2+
    • CPU: 4x 1.2GHz
    • RAM: 1GB
    • 2 USB + OTG
    • int eMMC 8Gb + MicroSD
    • WiFi(n)
    • Bluetooth(4.0)
  • Raspberry Pi 3B
    • CPU: 4x 1.2GHz 64bit
    • RAM: 1GB
    • 4 USB + OTG
    • WiFi(n)
    • Bluetooth(4.1+BLE)

Donation

If you are great R&R man, you can support my open-source development by a small Bitcoin donation.

Bitcoin wallet: 15phQNwkVs3fXxvxzBkhuhXA2xoKikPfUy