Melatonin Sine Machine, an additive Synthesizer that is easy to use and fun
October 28, 2025 Synth Anatomy News, Plugins, Software 2

Melatonin Sine Machine is a new additive Synthesizer plugin for macOS and Windows that promises to be easy to use and fun.
Additive synthesis is undoubtedly one of the most unusual forms of synthesis. Instead of using a subtractive approach, new, complex sounds are created by adding individual sine waves and other elements. This form is neither widespread nor popular.

This is because many additive synthesizers (hardware and software) are neither inviting nor intuitive to use—hundreds of parameters where you quickly lose track and interest.



Melatonin, a new software company based in Vienna (Austria), the city of music, is trying to change that with the new Sine Machine plugin.

Melatonin Sine Machine
Sine Machine is a new additive Synthesizer plugin for macOS and Windows, described as friendly. Indeed, the user interface is very inviting and colorful. More importantly, you will not be overwhelmed by a parameter wall when you first open.

At the core of the Melatonin Sine Machine plugin is a bank of 20 voices, each with 511 time-domain oscillators, for a total of over 10.000 oscillators. Ok, that sounds like a lot of parameter tweaking. Don’t worry, it’s been simplified.

Instead of tweaking individual oscillators, you edit them in bulk, making it easier to stay in focus. The UI consists of five areas that can be easily accessed with tabs: volumes, envelopes, trem, pitch, and voices.

At the volume level, you draw and edit the amplitude of the time-based oscillators in a spectrogram, as is familiar from other additive synthesizers. Purple represents lower frequencies, and red gives you the highest.

Additionally, you have drawing utilities, including additive filtering tools (brickwall and Gaussian band-pass). The result is directly visualized above.



Friendly & Nerdy Modulation
Then you can edit an ADSHR envelope with an offset, which also works in the same bulk approach. You control them for all. Sine Machine also allows you to delve deeper.

With the envelope’s Curve Control, you can precisely define how the envelope affects the oscillators. You can really nerd out there and go even further with the advanced mode.

The tremolo and pitch sections let you modulate amplitude and pitch independently with a syncable multi-wave LFO. Oh, wait—it’s not one—you get access to over 10,000 LFOs, as each oscillator in each voice has its own free-running LFO.

With features like offset or other tools, you can edit the modulation to avoid harmonic collisions. These two sections are where it gets interesting and where the oscillators gain motion. You can achieve a wide range of sound effects, including filtering, swarming, arpeggiators, and more.

In the voices section, you can adjust all the main parameters of your patch, like the voicing (mono, various unison modes, or randomize) or add glide time that can affect in different ways. Further, it offers MPE and microtuning support for MTS-ESP.

Melatonin Sine Machine ships with a factory-preset library you can start experimenting with.

First Impression
At first glance, Sine Machine is an inspiring additive Synthesizer with a very accessible, friendly user interface. I like that the plugin appeals to beginners with its colorful interface and to additive synthesis experts with its deeper features accessible with a few extra clicks.

According to the developer, it’s a soft launch, and offline authorization and full MPE implementation are coming soon.

Melatonin Sine Machine is available now for an early-access price of $50. The developer doesn’t participate in Black Friday deals or similar promotions. It runs as a VST3, AU, and CLAP plugin on macOS (native Apple Silicon + Intel) and Windows.

More information here: Melatonin