SY99
The New Synth Architecture and Parameters

The new synth architecture

Below is the block diagram of its architecture.

SY99VA editor block diagram


OSC1-3 are VA oscillators and OSC4 is a PCM oscillator.
OSC1 and OSC 2 interacts with Xmod.
OSC3 is a PWM oscillator.
OSC4 modulates OSC3 and PWM effect is added to the PCM.
Bend Modulation is the Auto Bend for the harmonics of VA section (OSC1-3).
Noise Modulation can be added to OSC3.
Wave Shaper adds some color to VA section.
VA section's output is sent to a Digital Filter.
All outputs are put into one Amplifier.
Then processed by a 4-pole Analog Filter.
Effects are EQ, Chorus, Delay and Reverb.
EQ's frequency can be modulated by an independent LFO.

Parameters

Put the cursor on the controllers and the parameter names are displayed.

OSC section:
Harm determines the oscillator's harmonic series.
Brt means the brightness of the oscillator's waveform.
Rate means OSC3's PWM rate. Pow means power, which affects both the brightness and the volume.

Oscillator Modulation:
FB - Feedback determines VA section (OSC1-3)'s density of the harmonics.
WS - Wave Shaper adds some color to VA section.
1<>2 determines the mutual cross modulation between OSC1 and OSC2.
4>3 determines OSC4's modulation to OSC3.
Nmod means Noise Modulation for OSC3.
Bend means Bend Modulation's depth.
Rate means Bend Modulation's speed.

Filter section:
FEG On: When you control the Analog Filter by EG, turn this switch on.

EQ section:
LFO: This LFO controls EQ's frequency and makes swelling effects.

What is happening inside SY99

SY99VA editor block diagram


SY99VA uses 1AWM&1AFM mode and Algorithm 42.
OSC1 is made by OP1/2, OSC2 is OP3/4 and OSC3 is OP6.
OP5 works as PWM by fixed frequency.
OSC1<>2's Xmod is the feedback amount between both operator towers.
"Wave Shaper" selects the waveform for all modulators (OP2/4/6).
"Bend Modulation" is the Pitch EG that affects only the modulators.
"Digital Filter" means control for all modulators.
"Analog Filter" controls all the filters of AWM and AFM.



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8. 12. 2003