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134 lines
8.6 KiB
Markdown
134 lines
8.6 KiB
Markdown
# ESFM instrument editor
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the ESFM editor is divided into 6 tabs:
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- **FM**: for controlling the basic parameters of FM sound source.
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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 (OP3)**: for macros controlling FM parameters of operator 3.
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- **Macros (OP4)**: for macros controlling FM parameters of operator 4.
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- **Macros**: for other macros (volume/arp/pitch/pan/operator 4 noise mode).
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## FM
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ESFM is four-operator, meaning it takes four oscillators to produce a single sound.
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unlike most four-operator FM synthesizers, however, ESFM does not have an algorithm selection. instead, it uses a fixed operator arrangement, but allows you to independently control the output and modulation input levels of each operator. this allows it to reproduce a few common four-operator algorithms, as well as unique combinations where operators act as modulators and carriers at the same time.
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these apply to the instrument as a whole:
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- **OP4 Noise Mode**: determines the mode used to produce noise in operator 4.
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- Normal: noise is disabled.
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- Snare: takes the snare noise generation mode from OPL. square + noise.
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- HiHat: ring modulates with operator 3 and adds noise.
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- Top: ring modulates with operator 3 and double pitch modulation input.
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- these are normally used for the drum channels in ESFM's OPL3 compatibility mode.
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- however, in ESFM, operator 4 can be modulated by operator 3, whereas in OPL3 drum mode the rhythm channels cannot be modulated.
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- __note__: usage of noise mode "Top" is discouraged for now as it is not properly emulated yet, and results may change when the emulation gets fixed in the future.
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- **operator routing preview**: shows how operators are connected with each other and with the audio output (at the bottom).
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- left-click pops up a small "operators changes with volume?" dialog where each operator can be toggled to scale with volume level.
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- right-click switches to a preview display of the waveform generated on a new note:
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- left-click restarts the preview.
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- middle-click pauses and unpauses the preview.
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- right-click returns to algorithm view.
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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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- **AM Depth (DAM/AMD)**: when enabled, LFO tremolo is deeper (1dB off; 4.8dB on).
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- **Sustain flag (SUS)**: when enabled, the envelope pauses ("sustains") once it reaches the Sustain Level and does not proceed to the release phase until note off.
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- **Envelope Delay (DL)**: determines the delay time before the envelope is triggered. the bigger the value, the longer the delay (0 to 7).
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- a change of one unit doubles or halves the delay time.
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- a value of 0 results in no delay.
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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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- **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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- **Key Scale Rate (KSR)**: also known as "Rate Scale". determines the degree to which the envelope execution speed increases according to the pitch.
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- **Frequency Multiplier (MULT)**: sets the coarse pitch offset in relation to the note (0 to 15). 0 is -1 octave, 1 is 0 octaves, 2 is 1 octave, 3 is 1 octave 7 semitones, and so on.
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- note that values 11, 13 and 14 behave as 10, 12 and 15 respectively.
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- **Tune (CT)**: sets the semitone offset in relation to the note (-24 to 24).
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- this is a software effect.
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- **Fine Detune (DT)**: shifts the pitch in fine steps (-128 to 127). 0 is the base pitch, -128 is -1 semitone, 127 is nearly +1 semitone.
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- this is a software effect.
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- **Left (L)**: toggles output to the left channel from the operator to the audio output.
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- **Right (R)**: toggles output to the right channel from the operator to the audio output.
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- **Waveform Select (WS)**: changes the waveform of the operator (0 to 7).
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- **Vibrato (VIB)**: makes the operator affected by LFO vibrato.
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- **Vibrato Depth (DVB/FMD)**: when enabled, vibrato is deeper.
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### routing controls
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- **Output Level (OL)**: sets the output level from this operator to the audio output (0 to 7).
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- 7 is the loudest level and 1 is the softest, while 0 disables audio output.
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- a change of one unit is about 6 dB.
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- this output scaling factor is applied after TL and envelope scaling have been performed.
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- **Modulation Input Level (MI)**: sets the modulation level from the previous operator to this operator (0 to 7).
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- 7 is the strongest level and 1 is the weakest, while 0 disables modulation.
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- a change of one unit is about 6 dB.
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- for operator 1 this controls the **feedback level**.
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- this modulation scaling factor is applied after the previous operator's TL and envelope scaling have been performed, but is unaffected by OL above.
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### common algorithms
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this table contains a list of modulation input/output level values which resemble common algorithms in Yamaha FM chips.
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__note__: MI1 is not included as it is the feedback level.
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| algorithm | OL1 | MI2 | OL2 | MI3 | OL3 | MI4 | OL4 |
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|--------------------------------|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| OPN algorithm **0** | 0 | 7 | 0 | 7 | 0 | 7 | 7 |
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| OPN algorithm **4** | 0 | 7 | 7 | 0 | 0 | 7 | 7 |
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| OPN algorithm **6** | 0 | 7 | 7 | 0 | 7 | 0 | 7 |
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| OPN algorithm **7** | 7 | 0 | 7 | 0 | 7 | 0 | 7 |
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| OPL3 algorithm **1** | 7 | 0 | 0 | 7 | 0 | 7 | 7 |
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| OPL3 algorithm **3** | 7 | 0 | 0 | 7 | 7 | 0 | 7 |
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| OPL3 algorithm **1** (variant) | 0 | 7 | 0 | 7 | 7 | 0 | 7 |
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### fixed frequency mode
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each operator has a Fixed Frequency mode. once enabled, the operator runs at the specified frequency regardless of the note.
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when fixed frequency mode is enabled, the Tune and Fine Detune sliders will be replaced by **Block (Blk)** and **FreqNum (F)**, which allow you to input a raw frequency value into the operator.
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the actual frequency is determined by the formula: `FreqNum*(2^Block)`.
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in other words, FreqNum defines the base frequency, while Block determines the scaling factor in octaves.
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## macros
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these macros allow you to control several parameters of FM per tick.
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## OP1-OP4 Macros
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most parameters are listed above.
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### envelope delay macro tricks
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due to a quirk in how the envelope delay feature works, the **Envelope Delay** macro can control the operator's key-on status for a limited amount of time after a note is played. a value of 0 represents key-on, while a value of 7 represents key-off.
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note that the macro cannot exceed 659.1 ms in length - anything beyond that will be treated as a value of 0.
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### operator arpeggio and pitch macros
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among the available macros are **Op. Arpeggio** and **Op. Pitch**. these work like the **Arpeggio** and **Pitch** macros featured below, but are applied to the individual operator, overriding the **Arpeggio**/**Pitch** macros respectively.
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the **Tune** and **Fine Detune** FM parameters are still respected when using these macros.
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### fixed frequency macros
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when fixed frequency is enabled for an operator, the **Op. Arpeggio** and **Op. Pitch** macros will be replaced by the **Block** and **FreqNum** macros. these can be used to change the operator's fixed frequency over time.
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## Macros
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- **Volume**: volume sequence.
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- **Arpeggio**: pitch sequence.
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- **OP4 Noise Mode**: operator 4 noise mode sequence.
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- **Panning**: enables output on left/right channels.
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- note that each operator also has its own pan controls, which get masked by this global pan control.
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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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