Pure Data to KORG NTS-1 mkII Converter

This web application allows you to convert Pure Data patches into custom user units (oscillators and effects) for the KORG NTS-1 mkII. (NTS-1 version is here.)
It’s a powerful and accessible way to build new sounds for your NTS-1 mkII — without writing a single line of C code.

Under the hood, it uses hvcc_nts1mkii, an external generator for HVCC, adapted to produce user unit code for the logue SDK for NTS-1 mkII.

🛠️ Features

* Convert .pd patches into ready-to-use KORG NTS-1 mkII user units
* Supports not only oscillators but also modulation, delay, and reverb effects
* No need to install any software — runs entirely in your browser
* Supports key parameters such as pitch, shape, and effect controls

🚀 Try It Now

➡️ Launch the converter
📂 Upload your .pd patch
📦 Receive a .zip containing ready-to-load user unit files for your NTS-1 mkII

🎁 Sample Patches

Explore example patches and prebuilt binaries:

➡️ User Units and Pure Data Patches for NTS-1 mkII

🔍 Supported Pure Data Objects

HVCC does not support every object from Pure Data.
Refer to this official list:

➡️ Supported Vanilla Objects (hvcc documentation)

If you use unsupported objects, the conversion will fail. Stick to this reference during development.

Some objects, like [noise~], may produce code that is too large to fit in an NTS-1 mkII user unit.
If you need a noise source, see this workaround for how to generate white noise using a table object.

🧰 heavylib: A Patch-Compatible Utility Library

A Pure Data library called heavylib offers prebuilt audio utilities compatible with HVCC. While originally designed for DAW plugins, some parts (especially oscillator patches) work well with this web app.

➡️ heavylib GitHub Repository

🎚️ Receiving Parameters in Your Patch

Your Pure Data patch can receive input from NTS-1 mkII using reserved parameter names. These are accessed via [r param_name @hv_param] where param_name can be pitch, shape, time, depth, etc.

* Differences between unit types *

unit type	max size	max SDRAM	knob A	knob B	mix	num. of params	predefined	DAC
osc	48KB	0	shape, shape_f	alt, alt_f	–	8	pitch, pitch_note, slfo, noteon_trig, noteoff_trig	1ch
modfx	16KB	256KB	time, time_f	depth, depth_f	–	8	–	2ch
delfx	24KB	3MB	time, time_f	depth, depth_f	mix, mix_f	7	–	2ch
revfx	24KB	3MB	time, time_f	depth, depth_f	mix, mix_f	7	–	2ch