USB Microphone to USB input of another USB device. How?

[Clemfm]

So, I have a USB microphone and I want to connect its output to the input of another USB audio device (A Roland VT-4 Voice Transformer). Not physically, only through my MacBook.

I am no expert on Mac USB audio, however, I have spent a day or so trying: aggregate devices, Jack and VB-Audio virtual cable.

Sending system audio out through the vt4 and then using the processed sound (eg recording in Quicktime) is easy, however, I simply cannot connect my USB mic output to the VT-4's USB input.

OMG, how hard can it be?

 

[Puonti]

Looking at the VT-4 manual, there appears to be only one USB type B port on the VT-4, which is used to connect the VT-4 to a computer in order to use it as an audio interface.

The manual makes no mention of the VT-4 supporting USB microphones.

How are you connecting your USB microphone to the VT-4?

 

[Clemfm]

Looking at the VT-4 manual, there appears to be only one USB type B port on the VT-4, which is used to connect the VT-4 to a computer in order to use it as an audio interface.

The manual makes no mention of the VT-4 supporting USB microphones.

How are you connecting your USB microphone to the VT-4?

Thank you for the reply. I am trying to connect the output to the input via my MacBook i.e. CoreAudio, and not directly physically.

 

[Clemfm]

It may not be an ideal solution, and I am open to all ideas, however, I skimmed this master's thesis Microsoft Word - Inter-appn-audio.doc by Richard Hallum and discovered the free "Line In". You can download it from Download LineIn for Mac | MacUpdate

This works perfectly for me. My USB Mic's output is now redirected to the VT-4, and I can use the VT-4's processed output with whatever app I choose.

I am certain that Line In is a 32 bit app, however, I have a number of these which I am not prepared to sacrifice as yet and so I will stay with OS X 10.14 for now.

There must be other apps which can perform this task?

 

[satcomer]

It may not be an ideal solution, and I am open to all ideas, however, I skimmed this master's thesis Microsoft Word - Inter-appn-audio.doc by Richard Hallum and discovered the free "Line In". You can download it from Download LineIn for Mac | MacUpdate

This works perfectly for me. My USB Mic's output is now redirected to the VT-4, and I can use the VT-4's processed output with whatever app I choose.

I am certain that Line In is a 32 bit app, however, I have a number of these which I am not prepared to sacrifice as yet and so I will stay with OS X 10.14 for now.

There must be other apps which can perform this task?

Loopback

 

[Clemfm]

Several hours of research later over the past week or so and here is my solution: SoX - Sound eXchange

sox -r 48000 -v 0.8 -V -t coreaudio "Realtek USB2.0 Audio" -t coreaudio "VT-4"

I installed sox and the above command pipes my USB microphone to a Roland VT-4 Vocoder.

I have also used Platypus to wrap the above command (which I have added to a bash script). The end result is an app which I can simply open and close as required.

The Line In app was olay, except I could not save my setup. Loopback might work, however, I always subscribe to the KISS principle whenever possible i.e. keep it simple stupid!

 

[satcomer]

That is what Loopback is a digital form on pre-pach panel in radio stations inside you Mac! that makes it super simple for me!