# Sound feedback after a key response
**URL:** https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533
**Category:** Builder
**Created:** [November 30, 2020, 10:34pm UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533 "2020-11-30T22:34:57Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@Moe](https://discourse.psychopy.org/u/Moe)
#### Post date: [November 30, 2020, 10:34pm UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/1 "2020-11-30T22:34:58Z")
Hi guys,
I’m trying to conduct the stroop test and I want to include a buzz whenever the participant makes a mistake. I went through YouTube videos and some of the posts about the same topic and I tried to mimic the procedure. However, whenever the experiment starts and when it’s supposed to give a noise it crashes.
I’m attaching snippets from the experiment, the code and the error that I got. Just as a note in the code you’ll find the “a” variable, it’s just a dummy variable to fill in the if statement.
Your help is much appreciated.
Thank you in advance.
---
### Author:  [@Michael](https://discourse.psychopy.org/u/Michael)
#### Post date: [November 30, 2020, 10:51pm UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/2 "2020-11-30T22:51:44Z")
Use something like Audacity to convert your sound file to 44.1 kHz rather than its current 48 kHz.
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### Author:  [@Moe](https://discourse.psychopy.org/u/Moe)
#### Post date: [December 1, 2020, 5:24am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/5 "2020-12-01T05:24:59Z")
Hi,
Thank you for reply. It worked. However, now, whether the keyboard response is correct or not the buzz sound will play. Do you have any idea why is this happening?
---
### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 1, 2020, 9:44am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/6 "2020-12-01T09:44:27Z")
Hello Moe,
you don’t need an if…else construction, if you don’t use the else-part.
```auto
if not key_resp_4.corr:
buzz = soundfile[0]
```
should do the work. The reason that the sound is always played means that the if…else construction always evalutes to the else-part.
When you want to play the sound after the participants has reacted you have to move the code-element from the **Begin Routine** tab to the **End Routine** tab.
Best Jens
---
### Author:  [@Moe](https://discourse.psychopy.org/u/Moe)
#### Post date: [December 1, 2020, 5:20pm UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/7 "2020-12-01T17:20:11Z")
Hello,
Thanks for your reply. I removed the else part and shifted the code from the “Begin Routine” to the “End Routine” tab. When I run the experiment, the following error occurs.
> File “C:\Users\Other user\Desktop\Noise Experiment\Noise Experiment\_1\_lastrun.py”, line 387, in
> sound\_1.setSound(buzz, hamming=True)
> NameError: name ‘buzz’ is not defined
>
> ##### Experiment ended.
The “buzz” is defined in the sound component shown in the figure below.
I tried to move the sound component above the code component (maybe it was an order problem) but the same error occurred.
Any ideas?
---
### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 2, 2020, 10:26am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/8 "2020-12-02T10:26:53Z")
Hello,
did you ever define the variable **buzz** somewhere before you use it for the first time, e.g. in the tab **Begin experiment**? The code-element should appear before the sound-element.
Best Jens
---
### Author:  [@chayabenyehuda](https://discourse.psychopy.org/u/chayabenyehuda)
#### Post date: [December 3, 2020, 6:49am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/9 "2020-12-03T06:49:01Z")
Hi
I am stock in the same problem.
how can i define the vairable buzz? i know how to define a massege. e.g :msg=" "
but how to define a sound?
i tried
soundfile = “incorrectBUZZER.wav”
---
### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 3, 2020, 7:55am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/10 "2020-12-03T07:55:03Z")
Hello
> [@chayabenyehuda](#):
>
> soundfile = “incorrectBUZZER.wav”
This defines a variable **soundfile** with the content **incorrectBUZZER.wav**.
Best Jens
---
### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 4, 2020, 11:59am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/12 "2020-12-04T11:59:34Z")
Hello,
here a small example which plays a sound when inccorrect and no sound when correct. I simply set the loudness to 0 when the response is correct while defining the same sound file for correct and incorrect answers.
[https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/7/d/7ddf9af6e7519e803dcf88275e9fba8672f70507.wav](https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/7/d/7ddf9af6e7519e803dcf88275e9fba8672f70507.wav) [SoundFeedback.psyexp](https://discourse.psychopy.org/uploads/short-url/lvGhyEiM21yib0qJM96Y5pWxomR.psyexp) (12.4 KB) [Stimuli.xlsx](https://discourse.psychopy.org/uploads/short-url/iJjHdJqjIhz7dMVCphsXrWXNyZ3.xlsx) (8.4 KB)
Best Jens
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### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 5, 2020, 11:45am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/13 "2020-12-05T11:45:41Z")
Hello,
as a matter of fact the code could be even simpler. You only need to set the loudness in your if…else construction. You do not have to set your feedback-file in the if…else construction.
Begin Experiment tab
```auto
msg = " "
soundFeedBack = 'CriticalStop.wav'
loudness = 1
```
Begin Routine tab
```auto
if key_resp.corr:
msg = "correct"
msgcolor = "green"
loudness = 0
else:
msg = "incorrect"
msgcolor = "red"
loudness = 1
```
Best wishes Jens
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### Author:  [@chayabenyehuda](https://discourse.psychopy.org/u/chayabenyehuda)
#### Post date: [December 6, 2020, 6:58am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/14 "2020-12-06T06:58:58Z")
Thank you! i actually did that and it worked 🙂
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### Author:  [@JensBoelte](https://discourse.psychopy.org/u/JensBoelte)
#### Post date: [December 7, 2020, 10:21am UTC](https://discourse.psychopy.org/t/sound-feedback-after-a-key-response/18533/15 "2020-12-07T10:21:10Z")
@chayabenyehuda
Do you mind marking it as solution? Then it is found more easily.
Best Jens