Copyright (C) 2017, 2018 Marvin Eagle <trailblazer77_2000@yahoo.com> Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
Chord Sequencer is a program that allows you to create a sequence of chords and play it out in a live performance chord by chord, changing chords using usb pedal or keyboard. The chords are played on the external synthesizer (Zynaddsubfx recommended, but any synthesizer that supports midi input and polyphony, should work), which is connected to the Sequencer using Jack. Every time you advance to the new chord in the sequence, the new midi signals are sent by the program to the synthesizer, producing a sound change. It is very helpful when you want to play another instrument at the same time using your hands, while your foot using pedal is changing the harmony of the piece.
First you need to open and start QjackCtl. If you don’t have it, it can
be installed by running sudo apt-get install qjackctl
To start program:
./sequencer
Then you need to connect it to the synthesizer.
To connect to zynaddsubfx: (assuming it was configured with jack)
zynaddsubfx -I jack -O jack -a
Note: just clicking on the zynaddsubfx
desktop icon may or may not be the right thing, depending on which options are
provided in the desktop shortcut command.
After you successfully opened the sequencer you will want to create several sample chords. You create the chords by creating notes. To make a note, click on the corresponding key on the keyboard. The note will appear on the chord display area. Clicking on the same key second time with the same chord being selected will delete the note.
Of course, you will need more than one chord to play. To create a new chord, you need to be in the Edit Chord Mode. There are 5 major modes in Chord Sequencer,
These 5 modes correspond to the 5 large green buttons on the bottom, which
are the modal buttons used to change between the modes.
Ok, now after you pressed the Edit Chord button and New Chord button
showed up, click on it and a new chord will appear on the chord screen.
The new chord is inserted right after the currently selected chord.
Or course, you will not be able to insert a new chord in this way
at the beginning of the song. To do that, use Main menu->Chord->New Chord
Before Selected. For example, if you need to place a new chord at the beginning
of the song, you would first select the first chord of the song, then click on
Main menu->Chord->New Chord Before Selected, and new empty chord will appear on
the chord screen.
Hint: to select a chord, click on the corresponding purple button right below
the chord.
To create a new note, make sure you have the right chord selected and press the corresponding key on the keyboard to the left. The new note will appear on the screen.
If for some reason the note you created does not fit well in the chord, you can always delete it by pressing the same key that you pressed when created this note. Make sure you have the right chord selected.
Selecting a note is as easy as clicking on it. The note will turn orange when selected. In order to see all things you can do with a selected note, though, you need to be in the Note Edit mode. Clicking on Note Edit button will bring you to the Note Edit mode. In this mode, you will see Multiple Select button, and if you click on it, you enter Multiple Select submode, which is not a separate mode by itself, but a submode to the Note Edit mode. Multiple Select allows you to select and edit several notes at the same time. So far the only thing you can do to multiple selected notes is to change their velocity (volume).
To deselect a selected note, click on it. The note will turn back to light green when deselected.
The program allows you to play single note from a chord. To do that, you need to be in Edit Note mode. Select the note and click on "Play Note" radio button. The note should start playing. To stop playing, click on "Don’t Play" radio button. Clicking on "Play Chord" radio button will play the currently selected chord.
Sometimes you need to change how the note is displayed on the screen in order to be in the consistence with the classical scale notations. There 5 display options available for use. They are listed below.
Note that not all of them will be available to each note you created. Only 2 or 3 options will be available, and if you want to see them, you need to change to the Note Edit mode by clicking on the corresponding modal button and selecting the note. Make sure you are in the Single Note select mode. You change the note display by clicking on corresponding available options.
Each note can be assignted different volume in the chord. It is done in the Note Edit mode by selecting note first, using a Note velocity slider to change the value and pressing Set Velocity button to save the set value of the note volume (veloctiy). Note that velocity is not changed until you press the Set Velocity button.
You enter Chord Edit mode by clicking on the modal Chord Edit button. In this mode you can delete, copy and paste the chords you created earlier.
To select a chord, click on the corresponding purple button right below the chord.
Copying can also be done through menu->Chord->Copy Chord, or just clicking Copy Chord button in the Chord Edit mode. Pasting can only be done when the empty chord is selected, you cannot paste over the chord that already has some notes in it.
To delete chord by selecting a chord in the Chord Edit mode and pressing Delete button, or selecting menu->Chord->Delete Chord.
You enter Play Chord mode by clicking on the modal Play Chord button. In this mode you can play any selected chord by pressing Play button. Pressing Next Chord button will stop playing current chord, select next chord and play it. Pressing Previous Chord button will stop playing the current chord, select the previous chord and play it. Pressing Stop button will stop all sounds.
If you are using sections, then when the chord progression reaches the end of the section, instead of moving forward for the next chord, it will jump to the chord that is a beginning of the next section, located to the right of currently played section in the section box. Same is true when moving back using previous chord button, only in opposite direction.
I want to go into a little bit more detail concerning playing chords, since
this is the main thing this program was designed to do. Normally I would
play chords by pressing a usb foot pedal, which in my case has 3 pedals which
emit signals 1, 2 and 3 depending on which pedal you push. The shortcut 3
I have assigned in the following fashion:
If no chords are played, it invokes the Play button in the Play Chord mode.
If chores are currently played, it invokes the Next Chord button in the Play
Chord mode.
The shortcut 2 I assigned to the Previous Chord button in the Play Chord mode.
The shortcut 1 is assigned to Stop button in the Play Chord mode.
The instrument is normally changed in the Synthethizer, but for the
convenience I include a list of selected instruments of Zynaddsubfx Collection bank.
Of course, you don’t have to buy or use the same pedal I got, this is why this program allows you to change any shortcut currently assigned to a command by clicking on menu Application->Keyboard Shortcuts, which will open a window where you can currently change shortcuts to 6 commands. If you want more shortcut functionality, please send me an email with the request.
To save a sequence of chords that you created, push Save button in the right bottom corner. The window will pop up asking you for a name to save the sequence. After entering a name and pressing Save button, your sequence is saved to the hard disk and will be visible in the list of all sequences.
To see all sequences, press modal Sequence button. A window will pop up with the list of all available sequences. To select a sequence, click on it’s name and press Select button. To delete a sequence, click on it’s name and press Delete button. Same with renaming the sequence.
To rename a sequence, you need first open it by using Sequence button -> select sequence. After the sequence is loaded on the screen, you can rename it by either pressing save button or clicking menu->sequence->rename sequence. The window will pop up asking for a new name.
Either select menu->sequence-new sequence or
Sequence modal button -> New Sequence button.
When you create a sequence of chord for a song, most of the time in can be divided into sections, like intro, verse, bridge, coda and so on. Of course, it would be nice to be able to repeat those sections as we play the sequence without having to write them again. That is exactly what sections are designed to do in this application. Note that none of the section operations including copying, pasting, deleting or joining will affect the original chord sequence that is displayed in the chord window. Make sure you save changes by pressing save button before exit.
To divide an existing sequence of chords into sections, first you need to load the sequence or create it from scratch as described above. After that, you enter the Section Edit mode by pressing Section modal button. Initially the sequence will be one big section, visualized as a grey rectangle below the modal buttons. To create new sections, you split this initial section into two by first selecting the chord that you want to be last chord in the left section, and then pressing Split button. The line will appear in the chord screen to the right of selected chord indicating the end of the left section and the start of the right section. You will notice that the grey box under the modal buttons will be split into two also, indicating that this sequence now has two sections. Additional section are created in the same way by splitting the existing sections.
To select a section, click on it inside the section box. The selected section will turn sea green color when selected. The selected chord in the chord window will jump to the start of selected section. To deselect a section, click on it again. It will turn back to grey color.
Of course, splitting the sequence into sections by itself does not
change the way it will be played, because all sections are in the same order
as they were before splitting. Note that the order of the sections in
the section box is the same order they will be played out when you
switch to the Play Chord mode, from left to right of the section box.
Rearranging sections is done by copying
and pasting them. To copy a section, first select it by clicking inside
the grey section box below the modal buttons, then press copy. When it
comes to pasting, you have two options: paste before or paste after
selected section. Decide where you want to paste the copied section
and select a section either before or after that place, then press
Paste before or Paste after button, respectively. The new section will
appear in the section box. All other sections will be resized smaller
to make a space for new one.
You can name and rename every section you create. The name will be displayed in the section box. When creating a name, you will have two options: either to name only selected section, or give same name to all same sections, created by copying and pasting. To name a section, first select it in the section box, then press the Re(Name) button. The window will appear first asking if you want to rename one section or all similar sections. After making this choice, you will be asked for a short name. (Obviously, long names will have to be truncated in the section box, so there is no point to make them longer than 6 - 7 characters.)
Joining two sections is the most complex operation in this program. Joining
was designed to be the opposite operation for splitting. It simplifies
the sectional structure of the sequence without changing the original
chord information. This kind of simplification is sometimes necessary
if you went too far with copying and pasting sections and want to step
back safely. In order to join consecutive two sections, mark them for
joining first by placing the selected chord in the left section
in the chord window. The section with the selected chord in it and the
section immediately to the right of that section will be marked for joning.
When you are ready press Join button. The line between the left
section and the one next to the right will disappear, indicating that these
sections are now joined together. The similar effect will be achieved if you
select the left section in the section box and press Join button.
The join operation can only be successful, if there is at least one
occurrence of the two sections marked for joining in the section box,
where they are placed next to each other in the same order as as they
are in the chord window. If there is more than one such occurrence, the
join operation will be done on all of them. nNote that if in the section
box there are other occurrences of these two sections marked for joining,
where they are separated from each other or not in the same order, they
will be deleted to preserve structural integrity.
To delete a section, first select it in the section box, then press Delete button. The section will be deleted only if there is another section with the same chord information in the section box.
Sometimes you need to connect additional instrument for playing along with the chords. To make this happen, you will need a second Zynaddsubfx instance (or other synthesizer). In case with Zynaddsubfx, you need to do it like this:
zynaddsubfx -I jack -O jack -a
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