Astralis A is the Oscillator based Synthesizer from the Astralis VSTi Pack and uses a Dual Oscillator for Synth 1 and a Spectral Oscillator for Synth 2, which is swappable for a second Dual Oscillator.
Astralis B uses the same system but has a single filter and a slightly reduced feature set with the aim of being lighter on CPU usage.
DUAL Oscillator

Uses 2 Oscillators with a variety of mix modes and is capable of a wide array of sounds.
OSC A/B: Selects the wave type between:
- Sine
- Saw
- Ramp
- Soft Ramp
- Peak Ramp
- Square
- Triangle
- Peak
- Octava
- Cluster 1
- Cluster 2
- H-A/H-B: Selects the number of Harmonics the Oscillator Uses.
Mode: Selects the interaction mode between the 2 oscillators between:
Single - Wave A only (standard mode)
Dual A+B, Dual A-B: PW controls phase of both waves
Dual Mix: PW controls Mix between waves A/B
Dual Width A+B, Dual Width A-B: PW controls phase difference between waves A/B - Can be used for Pulse Width Mod using Saw/Ramp waves
Ring Width, Ring Width+A: Ring signal = A*B : PW controls phase difference between waves A/B
Phase Distort: Wave B distorts the phase of Wave A: PW controls depth of phase distortion
Spectral Oscillator

The Spectral Oscillator uses 16 Individual Sine Waves to produce Harmonics, each harmonic level can be adjusted or modulated to create a sound wave.

SMOD: This controls the Spectral Modulation Volume. To Modulate use S Mod as destination in the Modulation Matrix.
Spectral/Dual: Switches between the Spectral Oscillator and a Second Dual Oscillator.