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generate signal for drawing lissajous figures

// repository documentation

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# Lissa delay

## About
Lissa is a delay module for Korg Nu:Tekt NTS1 and other synthesizers compatible with [logue SDK](https://github.com/korginc/logue-sdk).

The primary purpose of Lissa is to generate a sweep signal to display the waveform of the input signal on an oscilloscope as a [Lissajous figure](https://en.wikipedia.org/wiki/Lissajous_curve).

[![top-page](https://raw.githubusercontent.com/boochow/lissa/image/vpm.gif)](https://www.youtube.com/watch?v=_FJFkW42QLE)

Lissa passes the input signal to the right channel of output with no change. The left channel is used for sweep signal, which is one of sine wave, sawtooth wave, or the input signal with 90 degrees delay.

Lissa delay is mainly for fun and educational purposes. It is almost useless for the usual music production.

## How to use

1. Firstly, install an oscilloscope software with X-Y display capability on your PC or Mac. I recommend [Oscilloscope](https://asdfg.me/osci/), [Soundcard Scope](https://www.zeitnitz.eu/scope_en), or [Winscope](http://www.zen22142.zen.co.uk/Prac/winscope.htm).

1. Connect your NTS-1 output to the audio input of your PC.

1. Hit E key of NTS-1. Then, press EG button and select "oPEn" with the TYPE knob.

1. Press the DELAY button then select "LiSa" with the TYPE knob.

1. Adjust the aspect ratio of the Lissajous figure with the B knob.

1. Press the DELAY button and keep it pressed. Then turn the B knob clockwise to change the sweep signal to a sawtooth wave.

1. Adjust the pitch of the sweep signal (left channel) to the same value with the input signal (right channel).

1. Again press the DELAY button and keep it pressed. Tweak the B knob and watch how the figure is changed. Then modify the tone of input sound by the filter, OSC parameters, etc. and look at how it is reflected on the screen.

## Parameters

### Time

To synchronize the input signal and the sweep signal, you have to tune the sweep signal manually. That is done by the Time parameter, which is assigned to the knob A in the case of NTS1.

The time parameter varies from 0 to 127. This value represents a MIDI note number, which is used to determine the sweep signal frequency.

### Depth

The depth parameter controls the amplitude of the sweep signal.

### Shift-Depth

The shift-depth parameter changes the waveform of the sweep signal and its time offset. 
This parameter is between 0.0 and 1.0, and its default value is 0.5. 
The waveform and time offset become as follows, depending on the shit-depth value.

+ 0.0 .. 0.4: sweep signal is a sine wave. Offset varies from -0.5 to 0.5.
+ 0.4 .. 0.6: sweep signal is a delayed input signal. The length of the delay is a quarter of the wavelength, which is determined by the time parameter.
+ 0.6 .. 1.0: sweep signal is a sawtooth wave. Offset varies from 0.0 to 1.0.

## How to build

Place this directory under `logue-sdk/platform/nutekt-digital/` then type `make`.

## Others

My other user oscillators / modules are [here](https://blog.boochow.com/logue).

lissa

오늘의 추천 프로젝트

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