Multi Oscillator Linear Open Source Synthesizer

The purpose of this synth is to emulate various 80's synths in a single relatively low CPU module.

It combines 4 parallel polyphonic synths, also called Voices.

Each voice has multiple waveform generators that can be mixed, and can also be modulated in Frequency or Amplitude by another voice.

Each voice has 4 LFO and 3 envelope generators D-ADSR (Delayed ADSR).

Module parameters (VCO, VCF, VCA, Envelopes, LFO...) of all voices can be organized by groups to be synchronized together.

VCF embeds a Time Variant Filter with resonance, a high pass and a parametric band Eq.

Voices can be splitted along the keyboard, or overlapped or stacked.

MOLOSS embeds an effect section with Chorus, Double delay and a simple reverb.

It also have a polyphonic portamento since V24.07.24.

It is available as a stand-alone exe or 32/64 bits VST.

Demo tracks (done with several instances of MOLOSS and factory sounds) :
https://soundcloud.com/arthelion/moloss-ii-demo-2023

Legacy MOLOSS I demos :

https://soundcloud.com/arthelion/moloss-i-demo

https://soundcloud.com/arthelion/03-creepy-nightmare

This software is available under GPL V3 license.

Please send feedback using this link : http://www.arthelion.com/index.php/en/contact

To Do List

• Undo function
• Have several A / D / R shapes in envelopes
• Have several velocity and keyfollow shapes
• Solo command on mute buttons
• Various priorities for mono modes
• Keyfollow bias
• Envelope for PWM

Release notes

Note that factory sounds may be completed and tweaked with each release.

V25.04.23

• Chorus improvement
• Fixed: The indicator of modified sound was not appearing when changing a parameter value

V25.01.11

• Fixed: VST crash when closing window while automation is running

V24.08.10

Major LFO improvements :

• Various LFO waveforms available : triangle, sine, square, saw, reverse saw, "MW" (exclusive !) and random.
• New LFO Retrigger switch to allow LFO phase reset at first note start (when all notes are off)
• New LFO Phase knob to adjust LFO start phase when LFO retriggers, or to adjust relative LFO phase in non triggered mode
• LFO Sync buttons have moved from Modulation panel to main panel
• When a LFO is assigned to a group, the phases of all LFO in the group are reset to the selected value
• Pitch LFO max amplitude is now 1 octave
• LFO delay now only retriggers when all notes are off (as Retrigger switch does for phase)
• Some minor issues concerning LFO phase synchronization in non-retriggered mode are fixed

"Hold release" parameter behaviour changed :

• now when the parameter is set to max, release becomes infinite (nearly, 3 years actually) if controller n°64 is set to max ("true" hold).

Shortcuts added to optimise workflow while sound designing :

• Ctrl+S : Save current sound
• Ctrl+Alt+S : Save sound to a new file
• Ctrl+L : Load a sound
• Ctrl+Alt+I : Reinitialize sound
• Ctrl+C : Copy current voice parameters
• Ctrl+V : Paste current voice parameters
• Ctrl+I : Reinititialize current voice
• 1/2/3/4 : Display voice tab
• Alt+1/2/3/4 : Display voice tab and changes between voice and mod page
• 0 : Switch between voice and mod page

Caveat : in VST mode, host may interfere with some shortcuts. If so, try to run the instance in separate window or in bridge mode.

and other tweaks :

• mono non legato fixed : previous note was not retriggered
• some knob graphics fixed

V24.08.03

Various "historical" issues fixed :

• Knobs for aftertouch and controller effect on LFOs depth were inverted
• Controller effect on balance LFO depth was not wired
• LFOs depth is now smoothed to prevent glitches using ON/OFF controllers
• Sensibility of various knobs concerning pitch LFO depth has been improved
• Amplitude of Pitch LFO was clipped to 1 semi-tone instead of 5

V24.08.02

• Fixed : Bug in pitch release introduced with portamento mode

V24.07.24

• Added : Polyphonic portamento
• Bigger "mute" buttons
• Fixed : small issue in Mono Legato mode

V24.03.24

• Mono legato mode fix : Better TVF/TVA behaviour, now key follow is correctly used when note changes

V24.01.21

• Added : Buttons +/- on top right to resize window

V24.01.04

• Fixed : Intempesive noise on some notes with some oscillators (side-effect of table indexing)
• One new factory sound

V24.01.03

• Chorus effect improvements

V23.09.23

• The user interface is now fully resizable

V23.09.09

• Max gain of volume slider increased
• Some new sounds

V23.09.02

• Fixed : CPU usage issue. In certain cases silent voices continue to be processed unnecessarily.
• Fixed : The "Init voice" button was actually initializing ... the whole synth !!
• Bender influence on VCF cutoff frequency is now effective in both directions (up and down)

V23.08.30

• Fixed : Bandwidth was actually limited to sample rate/4 in some wave generators due to the lack of one harmonic table
• Fixed : When the audio device has been reopened (after sampling or changing buffer size), the chorus and delay are not properly reset
• Fixed : Modulation link groups where still not correctly reloaded
• Significant CPU improvement for some wave generators using wave table indexing
• Idle / muted voice CPU improvement
• CPU improvement when phase jitter is set to 0
• Latency of delay and chorus mix knobs suppressed
• Some tweaking in factory sounds

V23.08.28

• Fixed : Init of delay sometimes fails

V23.08.27

• Fixed : Changing polyphony mode while playing might hang VST host

V23.08.20

First official MOLOSS II Release

• New graphic design and ergonomy by Lozzec
• Improved settings ergonomy
• A lot of bugs and audio glitches fixed

V23.08.11

Last MOLOSS I version

• Fixed : Volume autoset could hang the VST

V22.08.15

• Fixed : Copy/Paste TVA Mod bender parameter was not working
• ADSR & LFO Links are now copied/pasted individually

V22.08.12

• Default attack envelope time reduced to 1 ms
• Controllers now add an offset on TVF cutoff and TVA level instead of multiplicative factor (more effective with envelopes having a big amplitude)
• Link groups of Mod's tabs are now copied with copy/paste function
• New button to control saw octave height
• New presets

V22.08.11

• Hangs fixed when adjusting parameters in some DAW

V22.08.10

• Fixed : All sliders now respond to vertical drag

V22.08.09

• Link groups : parameters can now be assigned to groups to synchronize them when adjusted
• Metronome function is fixed and works again
• Some crashes/hangs fixed when adjusting parameters or reinitializing sound in some DAW

V22.08.06

• Skin memory consumption drastically reduced
• Skin details enhanced

V22.08.05

• Better aliasing management
• Jitter emulation is not anymore linked to frequency to avoid noise effect in high frequency

V22.08.04

• New coloured skin
• Memory consumption for jitter emulation drastically reduced

V22.08.01

• Enhanced oscillator instability emulation (jitter)
• VCO jitter amount can now be ajusted for each VCO with a knob
• LFO start ramp has been enlarged for a more musical effect
• Bug fixed in delay initialisation

V22.05.24

• Recalibrated TVF LP & HP filters. Now it's possible to ouput a "perfect" square waveform in a voice.
• There are now 11 harmonics tables per waveform instead of 7 to improve sound quality in lower notes (may process a bit slower)

V22.05.23

• Fixed : Hi pass filter was not correctly setted when changing sounds, leading to distorted sounds.
• Fixed : Bad odd & even harmonics generation
• Improved : Sine & harmonics levels are not linked anymore

V22.05.07

• LFO start ramp is increased to 25 ms to avoid clics

V21.12.25

• Polyphony reduced to 16 voices because of realtime issues with long sounds

V21.02.09

• Fixed : Incorrect enveloppes when decay time is null
• Improved behaviour of TVF and TVA envelope depth parameter
• Some sounds added to default library

V20.05.24

• New parameter to sync Chorus LFO with tempo
• Improvement in LFO speed settings when synced with tempo.
• Now 100 corresponds to exactly one beat period, 200 half beat, etc...

V20.05.05

• Performance optimizations

V20.05.04

• Added : New parameter to control VCA with bender
• New formant sounds added to library

V20.03.08

• Fixed : some cracks when automating global parameters in DAW

V20.03.01

• New Poly ringing mode that doesn't stop a ringing note when retriggered
• Improved ADSR when depth is not 1

V20.02.16

• Stereo delay
• Metronome (mainly for standalone use)
• Added : some random phase noise & oscillator drift to gain warmth
• Optimization in tempo sync

V19.11.30

• New GUI look'n feel

V19.11.20

• Fixed : Incorrect volume autoset behaviour under Reaper DAW

V19.11.03

• Enhanced mono modes.

V19.10.30

• Initial version.