# Run test-flow / FFT with locally stored audio-file? **URL:** \ **Category:** QA401\ **Created:** [May 13, 2020, 4:09pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88 "2020-05-13T16:09:09Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![audio-dav](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@audio-dav](https://forum.quantasylum.com/u/audio-dav)\ **Post date:** [May 13, 2020, 4:09pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/1 "2020-05-13T16:09:09Z")
Hi, Planning to run the following setup: QA401 -\> transducer amp -\> ref speaker -\> “DUT” which is a microphone -\> XLR+phantom -\> mic-pre -\> QA401 The DUT also has USB-audio class output via an internal ADC that needs to be tested (not part of the XLR signal chain) Question: - Can we somehow pipe the captured chirp to the same analysis process? i.e. we will capture the usb-audio to a local .wav file then hopefully be able to pipe it to the QA software! /d ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [May 13, 2020, 5:33pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/2 "2020-05-13T17:33:00Z")
Hi @audio-dav, Your first setup should work fine where you are using the QA401 DAC to drive a speaker and then capture that back into the QA401. The first link below is similar problem, but comparing a mic to a reference mic. But in your case, you can readily capture the chirp and compare to a mask. For your question about loading a captured chirp into the QA401 software…that’s not currently possible but it’s a very reasonable feature request for the future (but not near term, unfortunately). 1. [Mic Comparisons under Tractor](https://forum.quantasylum.com/t/mic-comparisons-under-tractor/46) ---
**Author:** ![audio-dav](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@audio-dav](https://forum.quantasylum.com/u/audio-dav)\ **Post date:** [May 16, 2020, 2:39pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/3 "2020-05-16T14:39:48Z")
Thanks for reply Matt, Any alternatives to solve the USB-audio capture? I’d rather not do [mic -\> adc -\> usb audio device] -\> usb cable to computer -\> USB-soundcard/DAC -\> output it back to the QA401. ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [May 18, 2020, 4:03pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/4 "2020-05-18T16:03:54Z")
Not at this point. Just to make sure I understand: Is what you are looking for the ability to load a WAV file and then have analysis performed on that WAV file both in the app and also via Tractor? ---
**Author:** ![audio-dav](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@audio-dav](https://forum.quantasylum.com/u/audio-dav)\ **Post date:** [May 19, 2020, 9:01am UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/5 "2020-05-19T09:01:40Z")
in our case, we’ll run dotnet core on linux, so primarily needed here. but of course it’s nice being able to test it on windows in the QAxx app. I can see two solutions 1. load raw wav - where the file is something we capture via a raw usb-cdc/libusb ourselves - or via standard usb-audio to disk, or even better, pipe the audio directly to the QAxx app via “stdin” 1. offer class-compliant usb-audio input as an option. - in this case it’s important we can use both QA401 + the additional USB-audio in or out at the same time. ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [May 20, 2020, 5:04pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/6 "2020-05-20T17:04:22Z")
Hi @audio-dav, currently there’s the ability to File-\>Import a time series. This will let you pull in a time-series you’ve previously exported. If you had an external program that was writing the WAV, you could also have it write out a time series and then File-\>Import that. But I think what we need to do here is: 1. Add the ability to import a WAV from the file menu 2. Add the ability to import a WAV or time series programmatically 3. Add a test in Tractor that will force a WAV file to be loaded in QAAnalyzer.exe I don’t have an idea when the above will be done, but they are on the list. ```auto # TIME SERIES # 5/20/2020 9:57 AM # Units: Volts # Sample Rate: 48000 # Pre Buffer Size: 2048 # Data Points: 16384 # Atten Enabled: False # Time, Output Left Data, output Right Data, Input Left Data, Input Right Data 0.042666667, -0.113730041, -0.113730041,-0.102785794, 0.000000925 0.042687500, -0.127531189, -0.127531189,-0.117832134, 0.000018351 0.042708333, -0.139162639, -0.139162639,-0.130867125, 0.000026370 0.042729167, -0.148425763, -0.148425763,-0.141663462, -0.000019739 ``` ---
**Author:** ![audio-dav](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@audio-dav](https://forum.quantasylum.com/u/audio-dav)\ **Post date:** [May 21, 2020, 12:18pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/7 "2020-05-21T12:18:44Z")
good to know it’s planned! thx! how about allowing an additional usb-audio input? (you could still require the QA40x to be connected) ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [June 2, 2020, 10:55pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/8 "2020-06-02T22:55:25Z")
Hi @audio-dav, there’s now the ability to import a wav file. See the 1.909 release notes. ---
**Author:** ![audio-dav](https://avatars.discourse-cdn.com/v4/letter/a/8491ac/32.png) [@audio-dav](https://forum.quantasylum.com/u/audio-dav)\ **Post date:** [June 3, 2020, 8:56am UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/9 "2020-06-03T08:56:24Z")
fantastic! thanks matt! any chance to see streaming input (pipe or socket) or usb-audio-class as a next step? 🙂 ---
**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\ **Post date:** [June 3, 2020, 2:49pm UTC](https://forum.quantasylum.com/t/run-test-flow-fft-with-locally-stored-audio-file/88/10 "2020-06-03T14:49:44Z")
No, that’s not in the plans currently and probably won’t be added unless a really good use-case presents. The WAV import makes sense so that you can pull a wav from a remote server (an http address should work for the file name). This should permit testing mic sensitivity/frequency response on a internet connected device.