Raspberry Pi Tips


Environment: Raspberry Pi 3 Model B V1.2

Qtractor is a multi-track audio and MIDI sequencer and recorder. Uses JACK for audio and ALSA sequencer for MIDI as multimedia infrastructures. Standard MIDI files support (format 0 and 1).

Install Qtractor

1. Install qtractor

Installed qtractor from "add or delete application" on RPi.

2. start qtractor

  $ qjackctl &
  $ qtractor 

Qtractor automatically run qjackctl. However, if that is run implicitly, you cannot configure the output port at qjack.

3. Add track and clip

"Track setting"

"Track" > Add Track. You can select "Audio (existing file)" or MIDI (MIDI pattern).


For adding "clip" (a content of track), "Clip" > Add clip.

When adding clip at the first time, you need to add "session". "Session" is a group of "tracks" (that's relevant to a project). A session setting can be configured at "File" > "properties"

4. Setting Buses

"View" > "Buses"

For setting each track, double click on track at the main window

Main window

The assignment of input/output bus

Setting Qsynth

At Qsynth, "Setup" > "MIDI" tab > set MIDI Driver as "alsa_seq"

Connections (Audio)
Connectons (MIDI)

At Qtractor, "View" > "Windows" > "Connections":

  • Audio tab: connect Qtractor to system
  • MIDI tab: connect 129:Qtractor to 131:FLUID Synth