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Synth (Analogue / Subtractive) Plugin by Clay and Kelsy Instruments
Pro-Osc by Clay and Kelsy Instruments is a Virtual Instrument Audio Plugin and a Standalone Application and Soundware (samples or presets that load into other products) for macOS and Windows. It includes, and is therefore "powered by", Kontakt Player, which functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin, an AAX Plugin and a Standalone Application.
The OS and Format icons below are for the latest version of Kontakt Player. The version numbers are for Pro-Osc.
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30-Day: 16093; 7-Day: 14586; Yesterday: 24619

Pro-Osc was built with the samples of raw oscillators from a vintage-era analog synthesizer. With 14 different wave shapes, 30 custom convolution impulse responses, and over 80 presets, the Pro-Osc feels like a classic analog synthesizer with the ability to explore new sonic worlds.

Pro-Osc is full of beautiful sounds with no filler presets. We are really over getting a new instrument with only two presets we would actually use. Not this one boo. It's giving range, It's giving classic cinematic textures, it's a producers dream synthesizer. We took the time to craft a variety of Leads, Basses, Pads, Keys, Brass, Winds and Hits/FX that we would use daily. Each sound is performable with the mod wheel, extending the possibilities of what you can create.

With Pro-Osc, every wave shape we captured has many different samples across the entire range of the key bed, making it a more accurate representation of a true analog synth. (And honestly that's why it sounds so good).

Key Features:

-83 Handcrafted presets (that you will actually use).

-14 Sampled Wave shapes from a curtis filtered vintage-era analog synthesizer.

-30 Custom Impulse Responses (15 Reverbs & 15 Effects) taken from our favorite outboard reverbs and Eurorack effects.

-A Stepped sequencer that can change the wave shape on every note received. Giving some life and variation to your sound.

-Cut-Off LFO, Vibrato, Pitch Slop, and polyphonic Glide controls.

-Full NKS support. (Maschine & Komplete Kontrol Keyboards).


-Install and download all within Native Access.

-Runs in the free Kontakt Player, full Kontakt 6 or higher, Komplete Kontrol, or Maschine 2.

-Check out the Pro-Osc Quick Guide for more info.

-For installation guide and FAQ click here

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