SID3 instrument editor

the SID3 editor is divided into 8 tabs:

SID3: for controlling the basic parameters of SID3 sound source.
Wavetable: for controlling the wavetable synth.
Sample: for various sample settings.
Macros (Filter 1): for macros controlling parameters of filter 1.
Macros (Filter 2): for macros controlling parameters of filter 2.
Macros (Filter 3): for macros controlling parameters of filter 3.
Macros (Filter 4): for macros controlling parameters of filter 4.
Macros: for other macros.

Wavetable

this allows you to enable and configure the Furnace wavetable synthesizer. see this page for more information.

Sample

for sample settings, see the Sample instrument editor.

the only differences are the lack of an "Use wavetable" option, and the presence of a "Use sample" one.

SID3

Waveform: allows selecting a waveform.
- more than one waveform can be selected at once. in that case a logical AND mix of waves will occur...
  - although with default mix mode it does occur a bit wrong (like on 8580 SID chip). see below what happens when other modes are in use.
Special wave: allows selecting a special wave. the wave preview is to the right.
Wavetable channel: replaces and hides some macros and UI elements, and makes instrument operate with last wavetable/sample channel:
- Waveform macro now selects a wavetable
- Duty, Special Wave, Feedback, Noise Phase Reset, Noise LFSR bits and Wave Mix macros are hidden
- 1-Bit Noise macro now controls wavetable/PCM mode (it becomes Sample Mode macro)
Inv. left and Inv. right: invert the signal of corresponding stereo channels.
Attack: determines the rising time for the sound. the bigger the value, the slower the attack. (0 to 255).
Decay: determines the diminishing time for the sound. the higher the value, the longer the decay (0 to 255).
Sustain: sets the volume level at which the sound stops decaying and holds or also decays, but with different speed (0 to 255).
Sustain rate: sets the speed at which the sound decays after reaching sustain volume level. (0 to 255).
Release: determines the rate at which the sound fades out after note off. the higher the value, the longer the release (0 to 255).
Wave Mix Mode: dictates how different waves on the same channel are mixed together.
Duty: specifies the width of a pulse wave (0 to 65535).
Feedback: specifies the feedback level (0 to 255).
Reset duty on new note: overwrite current duty value with the one that's specified in the instrument on new note.
Absolute Duty Macro: when enabled, the duty macro will go from 0 to 65535 (in other words, control the duty directly rather than being relative).
Ring Modulation: when enabled, the channel's output will be multiplied with the source channel's.
Oscillator Sync: enables oscillator hard sync. as the source channel's oscillator finishes a cycle, it resets the period of the channel's oscillator, forcing the latter to have the same base frequency. this can produce a harmonically rich sound, the timbre of which can be altered by varying the synchronized oscillator's frequency.
Phase Modulation: when enabled, the channel's phase will be modified with the source channel's signal (signal is taken from filtered channel's output if filters are enabled).
Separate noise pitch: when enabled, the noise frequency/pitch will be controllable via special macros: Noise Arpeggio and Noise Pitch.

Then follow controls for each of the 4 filters:

Enable filter: when enabled, this instrument will go through the filter.
Initialize filter: initializes the filter with the specified parameters:
- Cutoff: the filter's point in where frequencies are cut off (0 to 65535).
- Resonance: amplifies or focuses on the cutoff frequency, creating a secondary peak forms and colors the original pitch (0 to 255).
- Filter mode: sets the filter mode. you may pick one or more of the following:
  - low: a low-pass filter. the lower the cutoff, the darker the sound.
  - high: a high-pass filter. higher cutoff values result in a less "bassy" sound.
  - band: a band-pass filter. cutoff determines which part of the sound is heard (from bass to treble).
  - multiple filter modes can be selected simultaneously. for example, selecting both "low" and "high" results in a bandstop (notch) filter.
- Output volume: sets the filter output volume (0 to 255).
- Distortion level: dictates how hard the signal is distorted (soft clipping). distortion is slightly asymmetrical (0 to 255).
Absolute Cutoff Macro: when enabled, the cutoff macro will go from 0 to 65535, and it will be absolute.
Change cutoff with pitch: when enabled, the cutoff will be scaled according to the frequency offset from specified note.
- Decrease cutoff when pitch increases: if this is enabled, filter cutoff will decrease if you increase the pitch. if this is disabled, filter cutoff will increase if you increase the pitch.
- Cutoff change center note: this note marks the center frequency at which no cutoff scaling is happening. the further you go from it in each direction, the more the cutoff scaling will be.
- Cutoff change strength: how much cutoff will be scaled.
Change resonance with pitch: when enabled, the resonance will be scaled according to the frequency offset from specified note.
- Decrease resonance when pitch increases: if this is enabled, filter resonance will decrease if you increase the pitch. if this is disabled, filter resonance will increase if you increase the pitch.
- Resonance change center note: this note marks the center frequency at which no resonance scaling is happening. the further you go from it in each direction, the more the resonance scaling will be.
- Resonance change strength: how much resonance will be scaled.
Filters connection matrix: controls routing of the filters' signals.
- In: this column connects the filters to ADSR sound output.
- next 4 columns make up the inter-filters connection matrix.
- Out: this column connects the filters' output to final channel output.

special noise LFSR configurations

this table contains a list of LFSR configurations that are automatically detected and brought to tune by Furnace. a short description is given. number needs to be pasted into Noise LFSR bits macro. it is recommended to place a single bar in Noise Phase Reset macro for the consistency of the wave.

LFSR config	Description
524288	wave very close to SID2 noise mode 1 wave. tonal, without very harsh overtones.
541065280	wave resembling vocals, has two main tones at least 2 octaves apart
2068	wave very close to SID2 noise mode 3 wave. tonal but with harsh timbre.
66	wave very close to SID2 noise mode 2 wave. timbre is somewhere in-between SID2's noise mode 1 and noise mode 3 waves.

if you find more interesting waves, please contact LTVA or tildearrow, so they can be added to Furnace frequency correction routine and to this table.

Filter `x` macros

Cutoff: filter x cutoff sequence.
Resonance: filter x resonance sequence.
Filter toggle: turns filter x on and off.
Filter mode: select filter x mode.
Distortion level: filter x distortion level sequence.
Output Volume: filter x output volume sequence.
Channel Input Connection: connect filter x to channel ADSR output.
Channel Output Connection: connect filter x output to final channel output.
Connection Matrix Row: connect other filters' outputs to filter x input.

Macros

Volume: volume sequence.
Arpeggio: pitch sequence.
Pitch: fine pitch.
Duty: pulse width sequence.
Waveform: select the waveform used by instrument.
- in wavetable channel mode controls the wavetable index.
Special Wave: select the special wave used by instrument.
Noise Arpeggio: noise pitch sequence.
- this macro is visible only if Separate noise pitch option is enabled. otherwise noise pitch is controlled by Arpeggio and Pitch macros.
Noise Pitch: fine pitch.
- this macro is visible only if Separate noise pitch option is enabled.
Panning (left): output level for left channel.
Panning (right): output level for right channel.
Channel Inversion: invert signal of left and right channels.
Key On/Off: envelope release/start again control.
Special: ring, oscillator sync and phase modulation selector.
Ring Mod Source: ring modulation source channel.
Hard Sync Source: oscillator sync source channel.
Phase Mod Source: phase modulation source channel.
Feedback: feedback sequence
Phase Reset: trigger restart of waveform.
Noise Phase Reset: trigger restart of noise accumulator and LFSR.
Envelope Reset: trigger restart of envelope (unlike key on/off, envelope is forced to restart from 0 volume level no matter which volume it is outputting now).
Attack: sets envelope attack speed.
- if you modify attack speed when the envelope is in attack phase it immediately changes.
Decay: sets envelope decay speed.
- if you modify decay speed when envelope is in decay phase it immediately changes.
Sustain: sets envelope sustain level.
- if you modify sustain level when envelope is in sustain phase it immediately changes.
Sustain Rate: sets envelope sustain rate.
- if you modify sustain rate when envelope is in sustain phase it immediately changes.
Release: sets envelope release speed.
- if you modify release speed when envelope is in release phase it immediately changes.
Noise LFSR bits: sets feedback bits of noise LFSR.
1-Bit Noise: controls noise mode.
- in wavetable channel mode it's called Sample Mode, and macro controls wave/PCM mode of the last channel.
Wave Mix: select the waveform mix mode.

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