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73 lines
4 KiB
Markdown
73 lines
4 KiB
Markdown
# OPLL FM synthesis instrument editor
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The OPLL FM editor is divided into 5 tabs:
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- **FM**: for controlling the basic parameters of FM sound source.
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- **Macros (FM)**: for macros controlling algorithm, waveform and feedback.
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- **Macros (OP1)**: for macros controlling FM parameters of operator 1.
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- **Macros (OP2)**: for macros controlling FM parameters of operator 2.
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- **Macros**: for miscellaneous macros controlling volume, arpeggio, and preset.
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## FM
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the OPLL synthesizer is two-operator, meaning it takes two oscillators to produce a single sound.
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however, unlike the other FM chips, only one custom patch may be set at a time, shared among all 9 channels.
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but don't worry! there also are 15 preset patches that you may select at any time.
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these apply to the instrument as a whole:
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- **Feedback (FB)**: Determines how many times operator 1 returns its output to itself (0 to 7).
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- **Sustain (SUS)**: enables the sustain flag (sets the release rate to 5).
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- **DC (half-sine carrier)**: Sets the waveform produced by carrier operator to half-sine.
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- **DM (half-sine modulator)**: Sets the waveform produced by modulator operator to half-sine.
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- **preset dropdown**: selects OPLL preset instrument.
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- this is the selector for the preset patches I mentioned before.
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- once a preset patch is selected, only the volume is configurable.
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- only one user-specified patch may be applied at a time!
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if you select the special Drums patch, you may use the instrument in Drums mode of OPLL. an extra setting also appears:
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- **Fixed frequency mode**: allows you to set a fixed frequency for the drum channels.
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These apply to each operator:
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- The crossed-arrows button can be dragged to rearrange operators.
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- **Amplitude Modulation (AM)**: Makes the operator affected by LFO tremolo.
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- **Envelope generator sustain flag (EGS)**: When enabled, value of Sustain Level is in effect.
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- **Attack Rate (AR)**: determines the rising time for the sound. The bigger the value, the faster the attack (0 to 15).
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- **Decay Rate (DR)**: Determines the diminishing time for the sound. The higher the value, the shorter the decay. It's the initial amplitude decay rate (0 to 15).
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- **Sustain Level (SL)**: Determines the point at which the sound ceases to decay and changes to a sound having a constant level. The sustain level is expressed as a fraction of the maximum level (0 to 15).
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- **Release Rate (RR)**: Determines the rate at which the sound disappears after note off. The higher the value, the shorter the release (0 to 15).
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- **Total Level (TL)**: Represents the envelope’s highest amplitude, with 0 being the largest and 63 (decimal) the smallest. A change of one unit is about 0.75 dB.
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- in the case of the second operator, it goes from 0 to 15 instead.
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- **Key Scale Level (KSL)**: Also known as "Level Scale". Determines the degree to which the amplitude decreases according to the pitch.
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- **Envelope Scale (KSR)**: Also known as "Key Scale". Determines the degree to which the envelope execution speed increases according to the pitch.
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- **Frequency Multiplier (MULT)**: Determines the operator frequency in relation to the pitch. (0-10, 12, 15 range)
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- **Vibrato (VIB)**: Makes the operator affected by LFO vibrato.
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## macros
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Macros define the sequence of values passed to the given parameter. Via macro, along with the previously mentioned parameters, the following can be controlled:
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## FM Macros
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All parameters are listed above.
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## OP1-OP4 Macros
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All parameters are listed above.
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## Macros
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- **Arpeggio**: pitch change sequence.
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- **Patch**: changes the playing preset mid-note.
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- through use of this macro, you may unlock different glitched sounds. useful for distortion guitars!
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- **Pitch**: fine pitch.
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- **Relative**: when enabled, pitch changes are relative to the current pitch.
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- **Phase Reset**: restarts all operators and resets the waveform to its start.
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# links
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[FM instrument tutorial](https://www.youtube.com/watch?v=wS8edjurjDw): A great starting point to learn how create and work with FM sounds. This was made for DefleMask, but all the same principles apply.
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