Working with Instruments

en

An instrument is a sound generator that plays notes on command.
Each instrument is comprised of a specific plugin that generates the sound and a number of common ways to control the sound generated.
Many parameters of an instrument can be changed in real time using Automation.

Contents

Creating an Instrument[edit]

You can create an instrument in a variety of ways.

The most common method is to drag a preset of the appropriate type from the relevant section of the Side Bar. You drop it into the appropriate editor:

This creates a new track in the Song-Editor or a new loop track in the Beat+Bassline Editor.

Drag and drop preset 1.0.0.PNG Xylophon dragged 1.0.0.PNG

You can also create a new instrument of any type by using the Instrument Plugin section of the Side Bar. Drag the new instrument into the Song-Editor as shown below.

Drag and drop instrument 1.0.0.PNG Dropped plugin 1.0.0.PNG

The Instrument Window[edit]

Various instrument windows look like this:

Plugins TripleOscillator1.0.0.png Plugins LB302 1.0.0.png Plugins Kicker1.1.0.png

The window is divided up into three main sections - the instrument controls at the top, the sound controls in the middle and the piano keys at the bottom.

Instrument Controls[edit]

The main controls are:


The pitch knob and pitch range is not found in Vibed because it has it's own pitch knob, called "Detune". Kicker also lacks these two controls because it can achieve effect without these controls.

Sound controls[edit]

The sound controls section is headed by a selector for five 'tabs':

Let's deal with these tabs in more detail.

The Plugin tab[edit]

The Plugin tab contains the controls that allow you to modify the sounds generated by this plugin. For more information read the individual Plugins page.

The Env/LFO/Filter tab[edit]

The Env/LFO/Filter tab looks like this:

Plugins EnvLFOVol1.0.0.png

Envelope basics[edit]

Note: VeSTige, SF2 Player, OpulenZ, ZynAddSubFX and LB302 won't respond to anything on this tab, since they are MIDI based instruments

The volume Envelope of an instrument controls the volume of a note over its lifespan--i.e. from the moment the note begins until it ends. The envelope starts when the note begins in the Piano Roll (which corresponds to pressing a real key on a piano), and ends when the volume of the note returns to zero (silence) which is usually sometime after the end of the note in the Piano Roll (which corresponds to releasing a real key on a piano).

The 6 envelope parameters, in order from the beginning of the note until it ends, are abbreviated DAHDSR (delay, attack, hold, decay, sustain, release). Immediately before the note begins, the envelope is at zero volume and the instrument produces no sound (silence). The delay is a time period that controls how long there is silence within the life span of the note after the note begins. The note then goes through an attack time period where its volume rises from zero to its maximum volume. Next is a hold time period during which the note remains at maximum volume. The note will then go through a decay time period to a lower volume called the sustain volume level (note that sustain is a volume level, not a time period). Lastly is the release time period which begins when the note ends in the Piano Roll. During the release time period, the note volume decreases from the sustain volume to zero volume (silence). If the end of the note (in the Piano Roll) is reached before the hold or decay time periods have completed (for example, a short note, and/or a long hold period, and/or a long decay period), then the sustain level might not be reached prior to the beginning of the release period. In this case, the note volume will decrease from whatever volume it was at when the end of the note was reached.

To get a feel for these parameters it helps to look at the volume envelopes of known instruments. A piano has a very short attack, no hold, a long decay to a very quiet sustain, and finally a release which is fast but not instantaneous. A flute has a slightly longer attack, a very short hold, a decay after the initial puff is expended, the sustain level is nearly the hold volume, and has a quick release. A bell has a short attack, no hold or sustain, and a long release. The sound of a car passing by has a long attack and long release.

The Env/LFO/Filter section has 3 'sub-tabs' that allow you to adjust 3 separate envelopes that affect 3 different targets: volume, cutoff, and resonance. The volume target, discussed above, is selected by default. You can select a different target by clicking on its label. For each target, you have 6 knobs to adjust the 6 parameters - delay, attack, hold, decay, sustain, release - and a 7th knob (AMT) to control the amount of effect that the envelope has on that particular target. Note that you can set the amount using the AMT knob or you can click directly on the envelope graph in order to turn it completely on or off. The graph is bright green when it's full on, grey when full off, and an intermediate green shade for anything between fully on (1.0) and fully off (0.0). The amount can also be turned down to a maximum of -1.0 (negative 1.0), which is only useful for the Cutoff and Q/Reso targets.

In order to understand what the Cutoff and Q/Reso targets, we must first deal with filters.

Filters[edit]

A filter is a method of changing a sound by letting some frequencies through and reducing other frequencies. For instance, a low-pass filter lets only the bass, or low frequencies, through and cuts the high, treble, frequencies. The frequency at which this takes place is set by the cutoff frequency control.

Although it is technically possible to build a frequency that has 'cuts' the unwanted frequencies entirely, it usually introduces unwanted delays and effects into the sound. Therefore, most filters also have a Q factor setting which controls how steep or sharp the drop-off is. The larger the Q factor, the steeper the drop-off in the sound level. In some filter designs, the Q factor also causes a resonance at harmonics of the cutoff frequency, so often the Q factor is also called the filter's resonance.

In order to enable the filter, press the filter title bar and the LED light at the left will turn on. When this light is on, the filter is active. Note that filtering the sound of an instrument adds a small amount of computer calculation time which can add a slight delay to the sound, so if you're not using the filter, keep it turned off.

The types of filters that LMMS offers are:

To the right of the filter dropdown menu are 2 knobs where you can set the Cutoff frequency and the Q/Resonance factor for the filter. You can experiment by choosing a plugin that generates multiple frequencies (anything other than a sine wave will do that), and then set the cutoff and Q/Reso factor and see how it changes the sound.

Filters with Envelopes[edit]

In addition, you can modify the static filter (described above) with an envelope. Both the Cutoff and Q/Reso envelopes are separate and independent from each other and the Volume envelope. The envelope will sweep the Cutoff or Q/Reso value from its maximum (or minimum) to the level set by the control (i.e. the knob to the right of the filter drop-down menu). For example, select a low-pass filter with the cutoff control (knob) set to 1000Hz, and shape the Cutoff envelope to sweep this cutoff value in a long attack and long decay. Then, during the note, the effect of the cutoff filter is to start at 14000Hz (the maximum), sweep down to 1000Hz (the control value) during the attack phase, and then sweep back up to 14000Hz (the maximum) during the decay phase. This will make the note sound like it's been damped down (during the attack phase of the cutoff envelope) and then the damping removed (during the decay phase of the cutoff envelope). Another typical use of this is to add a resonance that changes during the note's lifetime. In this case, the Volume and Q/Reso envelopes would be quite similar, so that as the note begins the resonance sweeps down, and then disappears upwards again when the note is released.

The Low Frequency Oscillator[edit]

Sometimes you may want to have the notes waver or change in a repetitive way. This is the purpose of the LFO (Low Frequency Oscillator). It is called 'low frequency' because it can have single oscillations (cycles) as long as 20 seconds rather than the hundreds or thousands of cycles per second of audible sound waves.

The LFO in LMMS is available to modify the value of the Volume, Cutoff, and Q/Reso targets independently. The LFO for each is available on the ENV/LFO tab, then select the desired Target sub-tab. The LFO has 4 knobs to the right of the LFO graph:

Below the LFO waveform display are 4 waveform shape buttons you can choose from.

Below the LFO knobs are 2 toggles:

To demonstrate an LFO for CUTOFF we add a long note and play it in a loop. We do this so we can hear the effect as we change our settings. Warning: wear headphones.

You need to monitor the output db, so open the FX-mixer and watch the amplitude. The instrument should only peak briefly. If it overshoots, try lowering either the general VOL or the RESO.

Only Dubstep uses a fast wobble like the one we have now. Change the SPD value and listen to the difference.

Also try the MODULATE ENV-AMOUNT toggle. In the Cutoff sub-tab, the effect is rather subtle, but it's more dramatic in the Volume or Q/Reso sub-tab.

This is pretty much it. You can now try different LFO curve shapes, but the default sine wave will give the smoothest result.

Envelopes can also be used separately on the Volume and Q/Reso sub-tabs, so try that.


The Func tab[edit]

The Func (Arp/Chord) tab looks like this:

Plugins Func1.0.0.png

Normally, each 'note down' command plays one note in the instrument. With the Arp/Chord controls, you can change this so that it plays a chord (using the note played as the root note) and/or an arpeggio (i.e. the notes of the chord played one after another rather than simultaneously). The Func tab is divided into 2 sections: one for chords and the other for arpeggios. You turn them on by clicking on their title bar and the LED light at the left will turn on.

Both sections have 2 common controls:

  • the list of chord types to choose from, and
  • the range (in octaves) over which the chord will be played.

Since some chords span more than one octave, some chords or arpeggios will overlap. The list of chords available is vast, ranging from standard chords through jazz to regional chords and natural modes such as Lydian and Dorian.

Chords[edit]

The chords section has no other controls than the ones listed above. When a note down signal is received, that note will be the base for the rest of the chord. All the notes of the chord will play simultaneously.

Arpeggios[edit]

The arpeggios section has several more controls:

The FX tab[edit]

Using LADSPA effects gives you many ways to control the sound of an instrument. These can vary from simple effects like delays and echos to complex phasers, distortion, and reverbs. Effects can also be chained one after the other to produce very complex sounds.

The FX tab looks like this:

Plugins FX1.0.0.png

On the FX tab, enable the Effects Chain by clicking the LED light at the top of the tab. This toggle switch gives you an easy way to compare the 'dry' sound of the plain instrument against the 'wet' sound with the effects in place.

Click the Add Effect button to select a new LADSPA/VST effect to add to the chain. Each effect gives you several controls to manipulate the process of sending sound to and receiving sound from the effect:

  • The W/D (wet/dry) knob sets the ratio between the input signal and the effect signal that combine together to form the output signal.
  • The Decay control sets the amount of silence that must pass before the effect turns off completely. The advantage to having the effects turned off during silence is that it reduces the amount of CPU time used for processing silence, and thereby reduces the chance of unwanted noise. However, if the effect turns off too soon it may introduce a 'clipped' sound to the effect. For example, with reverb, if the reverb time is longer than the decay time, then the reverb will be suddenly cut off before it has fully died away.
  • The Gate threshold sets the level of noise below which the instrument will be considered to be silent. For example, if you have a flanger effect with a very long fade-out (say a ride cymbal), it will be almost inaudible at the tail end of the cymbal. Cutting the effect off a bit early may reduce the CPU requirements and the chance of unwanted effect noise.
  • The Controls button toggles the display of a separate window that has additional controls specific to a particular effect.

Note that some effects may also have ways to set their internal wet/dry level. This may be in the form of a wet/dry knob, but also may be 2 separate knobs to set the level of the wet output and the dry (bypassed) output.

Each effect in the Effects Chain list has:

The MIDI tab[edit]

The MIDI tab looks like this:

Plugins MIDI1.0.0.png

These controls allow you to set the MIDI channels on which the instrument receives and sends MIDI events. Both controls work similarly.

  • Click the Enable MIDI Input or Enable MIDI Output toggle switch (LED light) to enable (or disable) MIDI events.
  • The Channel setting controls which MIDI channel the events will be received or sent on.
  • The Velocity control, when set, clamps all incoming or outgoing notes to a single velocity.
  • The Device selector button displays a list of the MIDI devices in your system that can act as sources or sinks for MIDI events.

For more about MIDI and how you can use it, visit Using MIDI

Piano Keys[edit]

At the bottom of the Instrument window is a small section of a piano keyboard. It will display the notes that are playing by greying out the key or keys as they're played. The scroll bar at the bottom of the piano keys allows you to move left and right on the keyboard to see all the keys.

Plugins-pianokeys.png

Base note[edit]

The green square just above the keys shows the 'base note' of the keyboard. You can drag the green square to any note position along the keyboard. Whichever note you select with this green mark will be played as A4 (i.e. the concert pitch of 440 Hertz). For example, moving it to A3 will make all the notes played by this instrument move up by an octave (since A3 is now A4). This allows you to adjust an individual instrument to be pitched correctly in relation to all the others. This is not important for synthesizers where the A4 note is programmed to be 440Hz. However, for the AudioFileProcessor Plugin, this is extremely useful, as it allows you to adjust the note to be played back at its correct pitch. As an example, if you recorded a saxophone playing a Bb, you would adjust the base note to be Bb, so that the saxophone was played in the same pitch as your other instruments.

Computer Keyboard[edit]

keyboard as piano

When the instrument window is selected, you can use the keyboard of your computer to play notes in a 2-octave range. It starts from Z at C3 and goes horizontally across the bottom 2 rows of the keyboard to M playing B3 (i.e. Z X C V B N M play the natural notes and S D G H J play the sharps and flats). It continues with Q playing C4 and uses the top 2 rows of the keyboard to P playing E5 (i.e. Q W E R T Y U I O P play the natural notes and 2 3 5 6 7 9 0 play the sharps and flats).
In addition, a MIDI keyboard can be used to send MIDI command to this instrument when it's selected.
Furthermore, the Piano-Roll window allows you to record notes as if you were playing a piano by using either a computer keyboard or a MIDI keyboard.

Navigation[edit]

References: Plugins

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