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https://github.com/ahlstromcj/sequencer64

A major reboot of Seq24. Current release 0.97.0 (2021-05-13), native JACK MIDI, Song recording, playlists, and a Windows/Qt version. For fresher code, see the Seq66 project. Note that trigger and mute-group-in-MIDI-file formats have evolved! Back up your work!
https://github.com/ahlstromcj/sequencer64

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A major reboot of Seq24. Current release 0.97.0 (2021-05-13), native JACK MIDI, Song recording, playlists, and a Windows/Qt version. For fresher code, see the Seq66 project. Note that trigger and mute-group-in-MIDI-file formats have evolved! Back up your work!

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README 

        
README.jack for Sequencer64 0.97.0 (Native JACK)

Chris Ahlstrom

2017-02-21 to 2021-05-07



This README file provides the things you need to know to run

the new native JACK implmentation of sequencer64, an executable called seq64.

The first thing to note about seq64 is that it supports both ALSA and JACK

MIDI.  If you run it to support JACK, and JACK is not present, then seq64

falls back to ALSA support.



To run seq64 to support JACK one must add the "-t" or "--jack-midi" option.

Why "-t"?  We are running out of option letters.



The next thing to note about seq64 is that the original JACK-transport options

are still present, but the JACK-transport support is *separate* from the

JACK-MIDI support.  The JACK-transport client is an invisible client with the

name "seq64-transport", while the JACK-MIDI client is visible in QJackCtl, and

is named "seq64".



To enable the JACK transport support, the options -j/--jack-transport,

-J/--jack-master, and -C/--jack-master-cond are available.



To enable the JACK MIDI support, the -t/--jack-midi options are available.

When enabled, the "transport" button in the main window will show the word

"Native" (even when JACK transport is also enabled).  Please note that, if you

select the jack-midi option and JACK is not available, seq64 will start in

ALSA mode and save that mode when exiting.  The JACK options are sticky

options.  That is, they are saved to the "rc" configuration file, so one does

not have to specify them in subsequent seq64 sessions.



The manual-versus-normal port support for JACK MIDI is essentially the same as

that for ALSA.  The -m/--manual-alsa-ports option actually provides what are

known as "virtual" ports.  These are ports that do not represent hardware, but

are created by applications to allow them to connect to other applications or

MIDI devices.



The different between manual/virtual ports and normal ports is that, while

normal ports are automatically connected to the remote ports that exist in the

system, while the manual/virtual ports are just created, and one must manually

connect them via, for example, the QJackCtl connections dialog.



So, if you want seq64 to automatically connect to all existing JACK MIDI

ports, do not use the -m/--manual-alsa-ports option... use the

-a/--auto-alsa-ports option.  Both options apply to both ALSA and JACK, but we

do not want to change the options names yet.



If you want the freedom to make the connections yourself, or with a session

manager, use the manual/virtual option.



One thing fixed in the new version is the ability to store MIDI note-on events

with the actual velocity provided by the MIDI keyboard used to generate the

notes.  Previously, even in seq24, the "Free" "Vol" option did not work.  this

is fixed.



Also, do not forget the "step" option.  If one paints notes with the mouse, the

note is previewed, and the note position advances with each click.  If one

paints notes via an external MIDI keyboard, the notes are painted and

advanced, but they are not previewed.  To preview them, click the "pass MIDI

in to output" button to activate it so that they will be passed to your sound

generator.



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