How to use a single-client ASIO driver with multiple applications on Windows

How to use a single-client ASIO driver with multiple applications on Windows

In this article you will learn how to use an audio interface with a single-client ASIO driver to run multiple applications at the same time on the Windows operating system.

What is a single-client ASIO driver?

A Windows ASIO driver that allows only one application at a time to use an audio interface is called a single-client ASIO driver. Similarly, a Windows ASIO driver that allows multiple applications to use the same audio interface simultaneously is called a multi-client ASIO driver.

Unfortunately, there are still audio interfaces that come with single-client ASIO drivers. Since Gig Performer with two instances counts as two applications, your second Gig Performer instance will be unable to use the audio interface (click here to learn what are the benefits of using multiple instances in Gig Performer).

If you plan to buy a new audio interface, we suggest that you choose an audio interface with multi-client ASIO drivers. Check the drivers page or contact the manufacturer to learn which interfaces support multiple applications running simultaneously. Note that this is not a Windows limitation but the developers’ decision and it may happen that a driver update brings support for multiple applications running simultaneously.

If you need to use an audio interface with a single-client ASIO driver, read on to learn how you can still use that audio interface with multiple applications.

Blue Cat’s Connector and their Windows ASIO driver

Blue Cat’s Connector
is an inexpensive audio and MIDI streaming plugin that can be used to transmit audio and MIDI signals in real time between several computers or applications, or to create your own routings within a single application with minimal latency. Blue Cat also provides you with a free Windows ASIO driver to allow integration with ASIO-compatible audio applications.

Blue Cat Connector is available as a free demo so we will show you an example setup using two instances of Gig Performer that you can try for yourself to help you get started.

First, click here to download Blue Cat’s Connector and their free Windows ASIO driver. In the Downloads pane on the right I downloaded “Win VST demo” and “Windows ASIO Driver”. After downloading, install both the demo and the driver.

In this example I’m running the main Gig Performer instance along with a second instance that I named “GuitarEffects” (click here to learn how to create new Gig Performer instances).

In your second instance, open Audio Options and select the “BC Connector ASIO” driver, as shown in the screenshot below:

BlueCat Connector and their free ASIO driver in Gig Performer

Note that you are limited only to two input and two output channels.

After you choose the desired Sample rate and Audio buffer size, click on the Control panel button. The Connector Slave Settings dialog appears and you can specify here your scope (Local host or Network), port and resampling (Fast, Medium or Best). Note the port numbers as you will need them later. NB: I’m using two Gig Performer instances on the same computer so I selected “Local host” (of course, Gig Performer could be located on two computers in your network).

Now, while you are in your second Gig Performer instance, click on the Wiring view and create an audio chain, e.g.:

Second Instance of Gig Performer- VST plugin Archetype Gojira on Gig Performer VST host

Now go to your main instance, insert Blue Cat’s Connector plugin, and connect it with inputs and outputs, as shown in the screenshot below:

Main Gig Performer instance with  BlueCat Connector VST plugin, hosted in Gig Performer

In its plugin editor window set the ports as indicated with the red rectangles. That’s it! When you play your instrument (in this case a guitar), you’ll be able to hear your guitar sound with the effects. NB: if the plugin in demo mode, you will hear occasional drop-outs.

Let’s look at the big picture and how the audio signal flows:

Diagram of Gig Performer and BlueCat Connector setup

First the audio comes from my Behringer audio interface with its own ASIO driver and goes to Blue Cat’s connector plugin. This plugin handles the routing of audio signals to and from the second Gig Performer instance, where we configured Blue Cat’s free ASIO driver and inserted the guitar effects plugin. This way is audio processing offloaded to another instance of Gig Performer (NB: read this blog article to see clever ways to optimize your plugin usage).   

VB-Audio Matrix

The VB-Audio Matrix is an audio framework to connect several ASIO devices, several Windows devices or different audio applications together. 

VB Audio Matrix and Gig Performer

There are 5 different types of slots available for use:

ASIO Devices – you can select up to 3 different ASIO devices.
Windows Devices – you can choose up to 4 different slots for Windows Audio devices.
– Virtual Audio I/O – there are 4 slots for virtual audio, used for playing back audio files, Windows sounds etc.
– VB-Audio Network – up to 4 different slots are available for various streaming purposes.
– Virtual ASIO devices – up to 4 different types of virtual drivers are available: an 8 channel, (2)-64 channel, and a 128 channel. 

Read the review of this application in this community post.


Read this blog article to see how to set up multiple instances of Gig Performer using ASIO4ALL. This driver is also able to aggregate your audio devices: 

Aggregate audio devices using ASIO4ALL in Gig Performer

Read this blog article to see how you can aggregate your audio device and a virtual audio cable driver.

One caveat: this driver introduces additional latency, so test and use with caution.

On some low-cost devices such as this one, ASIO4ALL is the only driver that is provided. This driver can also serve as a solid replacement for old audio interfaces with drivers that may crash Windows.

If you don’t play very percussive stuff or don’t need very low latency try ASIO4ALL (in some cases even Windows Audio may work well with your setup. See an example here). Here is an example of using ASIO4ALL from the Gig Performer in Action thread. 

ASIO Link Pro

Although abandonware, this software still runs remarkably well on Windows 10 and Windows 11 and introduces near-zero additional latency. It provides you up to 64 input and output channels. Visit this page to see how to download and install it on your PC.

In this example, I’ll route the outputs of another application (in this case Guitar Pro 7 with RSE engine) to Gig Performer to play along with drum and bass tracks. NB: Gig Performer v4.5 now allows you to record outputs of your audio interface, so you can capture your playing along with Guitar Pro’s sounds.

Let’s first configure the Audio Options in Gig Performer; select ASIO Link Pro from the list of available ASIO devices:

Gig Performer and ASIO Link Pro  

The following window will appear (if it doesn’t appear, look for it in the notification area of the task bar):

ASIO Link Pro Gig Performer
Click on the Enable multi-clients check box. This enables multi-client mode, so your ASIO driver can be shared by other ASIO-enabled applications.

Now start your audio application, and look for the Sound settings. In Guitar Pro 7, click on the Sound menu and then select Audio / MIDI settings:

Guitar Pro 7 Audio Setup with ASIO Link Pro

In this window, under the Audio settings group, select the ASIO device and then ASIO Link Pro for audio input and output. For the audio output select 3/4 (stereo) as we want to use these channels in Gig Performer.

Note that this window also appeared (if it didn’t appear, you can always find it in the notification area of the task bar):

ASIO Link Pro and Guitar Pro 7

Check the Route to ASIO IN check box (as indicated with the red rectangle).

Now go to the Wiring view and create the wiring as indicated below:

Gig Performer Wiring View with ASIO Link Pro and Guitar Pro

When you click on load a file and play it in Guitar Pro (for example, the bundled “All of them Witches” is cool) the outputs will be sent to channels 3 and 4 in the Gig Performer’s Audio In block. This way you can play along and record outputs of ASIO Link Pro, if desired.

NB: you see 6 audio channels in the screenshot above, as I limited the channel number to 6 – otherwise the screenshot would be very big, showing all 64 channels in Audio In and Audio Out blocks.

I also used ASIO Link Pro to route audio from Gig Performer to my video recording software in this YouTube video. Erik Schütz (@schamass) used ASIO Link Pro in this Backstage with Gig Performer episode.


JACK Audio Connection Kit (or simply JACK) is a professional sound server API and a pair of daemon implementations to provide real-time, low-latency connections for both audio and MIDI data between applications. It is great for taking the audio output from one application and sending it to one or more other applications. It is available for Windows, macOS and Linux.

Gig Performer Outputs to OBS using JACK

In this article we demonstrated how you can easily route audio using JACK and set up live streaming using OBS. 

Make sure to visit this thread for more solutions, tips and tricks from our Community.

Share this article it to support Gig Performer and spread the word! 🙂

Own The Stage® with Gig Performer®

Nemanja Pudar

Related topics:
How to offload the processing of audio plugins to remote computers using AudioGridder
How to use multiple instances of Gig Performer with JACK 

Scaling Curves

Scaling curves allow you to control the shape of the output of a widget or convert an incoming note velocity to a new velocity. Various predefined curves are available and they can be tweaked as necessary. You can also just draw your own curve as well to achieve the effect you require.


MIDI File Player Plugin

You can load up to 128 MIDI song files in a single plugin instance. Switch from one song to another, mute tracks and/or change their channel numbers. Tempo can be controlled by individual songs or you can use the global tempo and tap tempo to control the BPM interactively.


Favorites and Presets

Create a sound by placing and interconnecting your desired plugins, such as a synth, some effects and perhaps a mixer. Select them all and then save the selection as a named favorite. The favorite will subsequently show up in all plugin insert menus, making it easy for you to recreate that configuration whenever you need it again. This feature is also very powerful for creating your needed sounds on your studio computer and then transferring them to your touring laptop.


Probabilistic Sound Designer

Parameters you select in an open plugin are captured into the Probabilistic Sound Designer dialog window. When you click Randomize, you're only adjusting those selected parameters. Each entry in the PSD dialog has a curve but unlike widgets where the curve controls scaling, in the PSD the curves are used to define the probability of particular values being selected. Make sure the filter cutoff never gets too slow so as to block all sound. Perhaps adjust the max range of the VCA attack parameter so that the sound doesn't have too much delay. Constrain the octave ranges of the oscillators, perhaps ensuring that 1/3rd of the time we select 8' and 2/3rds of the time we select 4'. The possibilities are endless.


More Widgets

Numerous new widgets are included in Gig Performer - a new sustain pedal, plastic knobs, drum pads and more colored sliders. Shapes can be colored with different borders and fill colors and morphed from rectangular to circular. Your creativity is now the limit to creating fabulous front panels in Gig Performer.


MIDI Message Helper

Select MIDI devices by name. Choose the MIDI message type and adjust the appropriate parameters for the specific type



Layout management

Gig Performer supports arbitrary resizing. Layout your widgets the way you want - resize the main window and the widgets will grow or shrink as necessary to maintain the same interrelationships. No matter what size screen you have, your front panels will still be neat and usable.


Undo Support

If you move your widgets around and/or resize them, or even delete them by mistake, the Undo facility will correct your mistake. Minor moves to a widget by mistake will no longer spoil your design


Plugin Channel Count

Some plugins support a large number of outputs and they depend on the traditional channel strip to control how many ports should be available.   When you only need a stereo pair, it is convenient not to have a large horizontal block. In Gig Performer, the number of available ports  is controlled by the channel count override, which can be applied to individual plugins and will be remembered when the gigfile is reloaded or if the plugin is saved as a favorite.


Input muting and output fading

Rather than a single audio length tail, Gig Performer 4 gives you the ability to control input muting and output fading separately. Input muting controls how much time it takes for audio input to be silenced when you leave the rackspace. Output fading controls how much time will be taken for audio to fade out when you leave the rackspace.


Faster Plugin Finder

Instead of searching through menus of perhaps hundreds of plugins (you know who you are!), the Quick Plugin Finder makes it easy to find the plugin you need by simply typing partial strings. For example, as shown here, to find the Modartt Pianoteq 7 plugins, it's enough to type pia mod 7 (in any order, by the way)  to restrict the list of available plugins to those matching your query. The Quick Plugin Finder also knows about manufacturers, presets and favorites.



Touch Friendly Input

Any entry field can be changed by either dragging your mouse (or finger) up or down, or by using the large popup touchpad where you can just tap on the squares to enter a value. The large popup keypad also does validation so you can't enter an invalid value. You can also just tap the BPM field to pop up a larger view where you can quickly change tempo, tranpose, trigger Tap Tempo and enable Ableton Link, the last allowing you to synchronize Gig Performer with any other application that also supports Ableton Link.


New Tuner Display

The tuner view makes it easy for guitarists to quickly check and adjust their tuning. You can toggle into the tuner view from any other view and toggle right back as soon as you're done. All output will be silenced automatically while you're in tuning mode. You can adjust the concert reference pitch from its default of 440 Hz to suit your own needs. The tuner view fills the entire screen so you can easily see it from a distance.