ANALOGSOUNDfilters two oscillatorsANALOG
ANALOG is a virtual analog synth: two oscillators, noise and drive into a resonant filter, for anything that starts with a saw and a low-pass.
filters two oscillators
- Half
- SOUND
- Reach it
- white key A4 in the wheel
- ALGORITHM
- WAVE
- Engine
- ANALOG
- Factory sounds
- 12
Playing it
MAIN holds WAVE, CUT and RES, the filter's cutoff and resonance, and REL, the release (ATK is on ENV). Sweep CUT while holding a chord, or turn RES up and play low for squelch.
ANALOG is on A4 of the default wheel. With LINES it plays an acid line: its FILTER page is the 303's.
MAIN
| Knob | Label | Range | Starts at |
|---|---|---|---|
| 1 | WAVE | SAW SQR TRI SIN PWM SYNC SUB | SAW |
| 2 | CUT | 30Hz .. 16.0kHz | 2.5kHz |
| 3 | RES | 0% .. 100% | 24% |
| 4 | REL | 1.0ms .. 10.0s | 38ms |
Pages
OSC
WAVE picks the oscillator pair: SAW, SQR, TRI, SIN and PWM play two of the same wave, detuned by DTN; MIX blends them, and NOIS adds noise. Two settings change what the knobs mean. SYNC hard-syncs the second saw to the first (it restarts every time the first does), and DTN, shown as SYNC, sets how far above the first it sits: sweep it from the envelope or an LFO on SHP for a sync sweep. SUB makes the second oscillator a square an octave down, and MIX, shown as SUB, sets its level.
| Knob | Label | Range | Starts at |
|---|---|---|---|
| 1 | WAVE | SAW SQR TRI SIN PWM SYNC SUB | SAW |
| 2 | DTN | 0ct .. 127ct | 12ct |
| 3 | MIX | 0% .. 100% | 50% |
| 4 | NOIS | 0% .. 100% | 0% |
FLT
DRV drives the filter's input. KTR is key tracking, how far the cutoff follows the note you play.
| Knob | Label | Range | Starts at |
|---|---|---|---|
| 1 | CUT | 30Hz .. 16.0kHz | 2.5kHz |
| 2 | RES | 0% .. 100% | 24% |
| 3 | DRV | 0% .. 100% | 8% |
| 4 | KTR | 0% .. 100% | 50% |
FILTER
TYPE chooses low-pass, band-pass or high-pass. All three peak alike at the cutoff, so switching keeps the level.
| Knob | Label | Range | Starts at |
|---|---|---|---|
| 1 | TYPE | LP BP HP | LP |
| 2 | CUT | 30Hz .. 16.0kHz | 2.5kHz |
| 3 | RES | 0% .. 100% | 24% |
| 4 | KTR | 0% .. 100% | 50% |
Factory sounds
- SAW LEAD
- SOFT PAD
- SQR BASS
- PWM STR
- ACID
- SINE KEY
- RAVE
- SUB BASS
- PLUCK
- BRASS
- WIND
- STRINGS
Where it comes from
firmware/src/eng_analog.c, Felucca's engine (GPL-3.0), by Leo Kuroshita, Hügelton Instruments. The filter is Simper's trapezoidal state-variable filter.