Patching

Modular synthesis consists in producing sounds by connecting modules together with cables. These modules can generate or process audio and control signals.

The cables used to connect modules are called patch cables, the act of connecting modules is called patching, and the resulting creation is called a patch.

Building patches is done with these simple operations:

• adding modules,
• moving modules,
• removing modules,
• duplicating modules,
• connecting modules,
• disconnecting modules.

These are explained in depth in the Building a Patch section. But before going any further, let’s take a look at what you may find in a typical module.

Anatomy of a Module ⚓︎

The following image shows the characteristics and layout patterns that are found in most modules.

• Module Name Tells you what type of module you are working with. Right-clicking (or command-clicking on Mac) on the name will open a pop-up menu with two commands: Show Online Help will open the manual page for the module, and Remove Module will remove the module from the rack.
• Output Jacks Orange jacks, located on the right side of the module, are for output. The output jacks at the bottom-right of the module are usually the main output jacks, where you will retrieve the signal produced or modified by the module. Some modules, such as the ADSR shown above, have some extra utility outputs.
• Input Jacks Grey jacks, usually found on the left side of the module, are for input. Many modules need an input signal to work; for those modules, the main input jack will be found at the bottom-left. Some inputs are located near a big knob and have their own attenuverter¹: they are called modulation inputs. These are explained in depth in the Multiphonics Concepts—Modulations section.
• Parameter Knobs The labeled knobs are the knobs that will change how a module behaves. To turn a knob, click on it, hold the mouse button down and drag the mouse up or down. Many knobs have a default value, which is set by double-clicking on the knob. For fine-tuning, hold the Shift key down while turning the knob. Most knobs have modulation inputs located on their left or below. However, some utility knobs such as the Lin/Exp knob pictured above may not have them.
• Push Buttons These are used in some modules to trigger inputs by hand (as in the ADSR shown above), or to change between different modes of operation (such as the ×100 switch in the Pulse module).
• Indicator LEDs LEDs are found on many modules to show different aspects of the current module state.

Building a Patch ⚓︎

Adding Modules ⚓︎

Modules are found in the module browser. If the module browser is not currently visible, clicking in an empty part of the rack will show it.

A module is added by drag-and-dropping it from the browser, or by clicking on the + button next to the module image at the bottom of the panel.

When using drag-and-drop, the location where the module will be inserted is shown with an orange bar. Otherwise, the module will be inserted in the last row where you clicked in an empty spot.

Moving Modules ⚓︎

When your patch contains too many modules and connections, you may want to reorganize the modules in a different order to make the patch clearer. You can move a module by clicking on its name, holding the mouse button down and dragging it to the desired location.

The location where the module will be moved is shown with an orange bar. If no orange bar appears, there may not be enough space in the row. In that case, try dragging the module to a different row.

Removing Modules ⚓︎

A module is removed by right-clicking (or command-clicking on Mac) on its name and choosing Remove from the pop-up menu.

Duplicating Modules ⚓︎

An existing module can be duplicated by right-clicking (or command-clicking on Mac) on its name and choosing Duplicate or Duplicate (with input connections) from the pop-up menu.

• Duplicate Creates a copy of the module to its right, with the same parameter settings.
• Duplicate (with input connections) Creates a copy of the module to its right, with the same parameter settings and the same input connections.

Connecting Modules ⚓︎

Modules are connected by performing a drag-and-drop operation from one jack to another: click on the source jack, hold the mouse button down and drag the patch cable to the target jack.

Connections are always between an output jack (orange) and an input jack (grey). An output jack may have many cables connected into it, so the same source can easily be sent to different parts of the patch. However, an input jack can only have one connection.

To connect many different sources into the same input jack, add a mixer, like the Mix 8 module, connect all sources into the mixer input, and connect the mixer output to the targetted input jack. The mixer will also let you adjust the relative volume of each source.

The following video shows how to create a very simple synth by connecting the sawtooth output of a Classic VCO to the input of a VCA, the output of the VCA to the audio output, the Keyboard Gate to the CV input of the VCA to let the sound through when a note is played, and the Keyboard Pitch to the VCO Pitch to play the right note.

If patch cables obscure important controls in some modules, you can make them transparent or invisible by changing the Cable Opacity setting from the View menu in the toolbar.

Multiphonics does not impose any restrictions on how the modules are connected to each other. A patch can have any number of feedback loops, and a module can even be connected to itself.

Disconnecting Modules ⚓︎

There are two ways to disconnect patch cables:

• For input jacks only Click and hold the left mouse button and move the cable to an empty spot of a module, or to another input jack to reconnect it there.
• For any jack Right-click (or command-click on Mac) on the jack and choose Delete Cable from the pop-up menu. This will remove all cables connected to that jack.

Saving Patches ⚓︎

When you like what you hear, you can save your patch to the User collection of the patch browser by clicking on the Save button in the toolbar.

Enter the patch name in the text field at the top, choose a category from the drop-down list or create a new one with the New button, and click on Save to save the patch to your User collection.

A patch file stores everything you see in the rack (modules, connections, knob settings), as well as the current settings from the effects panel

When using Multiphonics as a plug-in in a DAW, saving the project in the DAW will automatically store the rack, effect panel and setting panel contents in the project.

If you load a patch from the User collection, modify it and save it with the same name, it will replace the original file without asking.

If you load a patch from the Factory collection and save it with the same name and in the same category, it will not overwrite it in the Factory collection since it is read-only. Instead, a new category with the same name will be created in the User collection, and the patch will be stored in that category. When showing all patches in the browser, the saved patch will appear twice: once with [Factory] and once with [User] appended to its name.

Video Tutorials ⚓︎

The quickest way to get a hang of patching is to fire up Multiphonics and build some patches. To help you get started, we created some video tutorials you can follow:

https://www.applied-acoustics.com/l/multiphonics-cv-2-video-tutorials/

Advanced Features ⚓︎

Multi-patching ⚓︎

In some situations while you are pulling a cable, Multiphonics will show one or more extra dotted cables. If you press the Shift key before you release the mouse button to complete the connection, all of the suggested connections will be made. This can be a real time saver for stereo or multi-channel patches.

This section describes various scenarios where you might encounter this option.

Stereo to Stereo

To connect two stereo modules together in one action, pull the cable from the left channel of the source and connect it to the left channel of the destination while holding down the Shift key.

The following video shows how to create a simple stereo effect patch with the Objeq Filter module, using the Shift key for quicker stereo patching. Notice how we pan the left and right channels in the Output Mixer to preserve the full stereo width of the processed signal.

Stereo to Dual-mono and Vice-versa

While most audio processing modules are stereo, some utilities can still be mono. In that case, stereo connections are still possible as long as the two mono modules are placed next to each other. Pull the cable from the left output channel of the stereo source, and connect it to the leftmost mono module.

Dual-mono to stereo connections can also be achieved by pulling the cable from the output of the leftmost mono module and connecting it to the left input channel of the stereo module.

The following video shows how to build a polarity inverter with two Inverter modules, taking advantage of stereo to dual-mono and dual-mono to stereo patching.

One to Many

It is often useful to connect a single CV-source to multiple identical modules. For example, in a synthesizer, you may want to connect a pitch signal to many oscillators. As long as the target modules are identical and are next to each other, Multiphonics will offer to make multiple connections with the Shift key. To connect to all modules, pull the wire from the source to the input of the leftmost destination module.

In the previous example, note how the third Compact VCO was not connected to the pitch, since it was not contiguous with the first two.

Many to Many

When designing a synth with multiple voices, you may end up in a situation where you need to connect 3 oscillators to 3 filters, then 3 filters to 3 VCAs, and so on. You can take advantage of the Shift action to do all connections at once as long as the following is true:

• the source modules are identical,
• the source modules are next to each other,
• the destination modules are identical,
• the destination modules are next to each other,
• there are the same number of source and destination modules,
• the cable is pulled from the leftmost source to the leftmost destination.

Many to One

Multiphonics will also offer to connect the output of multiple identical modules into a single multi-input module like a mixer. Pull the wire from the output of the leftmost source module to the first channel where you want that connection to go. The other modules will be connected to the subsequent inputs.

This video shows how to connect four oscillators playing different tones to the four channels of the Output Mixer using the Shift key.

…and Many More

Only the most common scenarios have been described here. The more you use Multiphonics CV‑2, the more you’ll get a better feel of what is possible with the Shift action.

Caveat

Some patching situations can match more than one of the scenarios described above. For example, in the following image, Multiphonics offers to patch the second Saturator to the second µHP, but it could also have offered to patch the right channel of the first Saturator to the right channel of the first µHP.

While designing this feature, we had to arbitrarily choose what connection to suggest when we encountered situations such as these. Because of that, in complex patches, you may encounter situations where the suggested connections are not what you need. In that case, you will have to make those connections manually, without the Shift action.

Multi-module Parameter Changes ⚓︎

If the patch contains multiple modules of the same type next to each other, you can change a parameter in all modules by holding down the Alt key while turning a knob or clicking on a push button.

• For knobs, the movement will be relative to the initial knob position in each module. For example, if you had two oscillators with their frequencies set to C and G, and you turned the C knob up to E, then the other oscillator would now have its frequency set to B, thus keeping the same relative interval between the two oscillators.

• For knobs that have default values, double-clicking while holding Alt will set the default value in all modules.

• For switches and selectors controlled with push buttons, all modules will synchronize to the same value.

In the following video, all parameter changes are done with the Alt key held down. It shows:

• a plain multi-module parameter change on the Gain knob,
• the behaviour when the initial knob position is different on the Bias knob,
• how to set the default value on both modules by double-clicking on the Bias knob,
• the behaviour for selectors with the Curve push-button, starting with a different value.