Sampl

Sampl is a powerful audio graph builder integrated in the Unity Editor. It allows

you to bake unique procedural audio clips from noise, trigonometric or instrument primitives,

coupled with mathematical operations, filters, etc.

Sampl works natively with any render pipeline on any Unity version above

2020.3

Setup

The whole package is contained in the Sampl folder resulting from the import. You can move it wherever you want, but it is recommended to keep the same folder structure.

Basics

You can create a new Sampl graph from the right-click context menu in the project window.

Each graph is saved as a SamplObject in a .asset file. You can recognize

them with the Sampl logo. You can change some parameters from the inspector such as sampling frequency and the length of the clip.

You can open a graph by double-clicking on it. The window will try to dock itself next to the scene window, otherwise it will appear as a floating window, that you can dock manually.

The provided procedural rain example

Navigation

The navigation in the main canvas is similar to other graph editors such as Shadergraph or the animator. You can zoom in/out using scroll wheel, move by click & drag on the mouse scroll wheel. Nodes can be selected by clicking on it, by drawing a selection rectangle, or by using Ctrl + click. You can drag selected nodes to move them.

You cannot select or interact with links: they are 100% visual. To add a link, you must click and drag from an output, links cannot be created backwards. To remove a link you must remove one of the nodes it connect, click the red cross on its left, or connect another link to the same output node. There is a header on the top of each window containing information and buttons to save, save as, reload the graph, export all the export nodes, or show/hide stats on each node.

To create a new node, just right click on the canvas and a context menu will appear. You can also start building a link and releasing the mouse left button in a free space, the same context menu will appear and the link will be associated with the first input (if there is any) of the added node. You can cancel by pressing ESC.

Some nodes contain one or several parameters. You can change their value as a text edit or as a slider with the mouse.

Once you are happy with a node's clip, you can export it as a static wav clip using an Export node. You can use as many Export nodes as you want. So far, Sampl only supports WAV export.

You can browse the path by clicking on the Folder icon. Make sure you select a path included in the Assets folder of your project.

Nodes list

All of Sampl's primitives

Multiply

Multiplies two inputs. The Multiplier parameter can adjust the output gain.

Add

Adds the two inputs

Subtract

Subtracts the input A with input B

Clamp

Clamps the input in the given range

Invert

Inverts the phase

ShiftScale

A multiple parameter node to control the pitch and a relative temporal offset

Lerp

Linear interpolation between 2 clips A and B, following the T curve. T's [-1,1] interval is remapped according to the provided parameter.

Warp

Temporal warping feature. For each sample in the output clip : $Output[i]=Input[i+Dist[i]*Multiplier];$

Reverse

Time reverse.

Remap

Linear remapping of the input [-1,1] into the given interval.

Equalizer

Experimental. An FFT based GPU equalizer. Uses unity built-in curve widget.

Reverb

Simulates reverb. Useful to "smooth" an aggressive sound

Delay

Echoes with linear damping. You can control the number of feedbacks and their interval with the given parameters.

Maximize

Amplifies samples that are above the intensity threshold given in the parameters.

Envelope

Returns the intensity envelope of the input signal using the given window size. The ouput is always in the [0,1] interval.

Resample

Simulates a downsampling to the given number of bits.

Fade

In and Out fading.

Widen

Experimental. Useful to get a proper stereo track from a mono one.

Constant

Constant value in the interval [-1,1]

Noise

White noise.

SineWave

Pure sine wave. You can control the frequency, phase and the amplitude from the parameters.

Sawtooth

Sawtooth wave. You can control the frequency, phase and the amplitude from the parameters.

TriangleWave

Triangle wave. You can control the frequency, phase and the amplitude from the parameters.

SquareWave

Square wave. You can control the frequency, phase and the amplitude from the parameters.

SineRamp

Linear pure sine riser. You can control the frequencies, phase and the amplitude from the parameters.

DynamicSine

Outputs a sine with a variable frequency, depending on the input and the remapping parameters provided. You can choose the sine type, phase, window size (the lower the better but also the longer to process), and amplitude from the parameters.

AudioClip

Outputs the given AudioClip. An operation is performed to adapt the sample rate to the graph's one, but the samples are not stretched to fit the length of the clip, padding 0 are added instead (or the clip is clamped if it is longer).

Kick

Experimental. Close from the pad sound but dissonant.

Pad

Experimental. A simple synth sound.

Curve

Draw your own curve from unity curve input widget.

Export

Export any clip you want. Mono and Stereo are supported. The provided path must be in the Assets folder from the current project.

Troubleshooting

The graph is frozen, spams errors and no nodes are showing up

The Unity Editor can sometimes free up memory and delete some nodes audio clips. Try to change tab if it is docked, right click on the frozen sampl graph tab and select "close tab". Reopening the graph should solve the issue.

Contact

Feel free to contact me via e-mail: support@leochaumartin.com