# USB audio interface - how to setup correctly?

**URL:** <https://community.blokas.io/t/usb-audio-interface-how-to-setup-correctly/3008>\
**Category:** Patchbox OS\
**Created:** [May 20, 2021, 6:04pm UTC](https://community.blokas.io/t/usb-audio-interface-how-to-setup-correctly/3008 "2021-05-20T18:04:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sn\_Lx](https://community.blokas.io/user_avatar/community.blokas.io/sn_lx/32/1913_2.png) [@Sn\_Lx](https://community.blokas.io/u/Sn_Lx)\
**Post date:** [May 20, 2021, 6:04pm UTC](https://community.blokas.io/t/usb-audio-interface-how-to-setup-correctly/3008/1 "2021-05-20T18:04:15Z")

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Hi there,

i am trying to use my tascam dr40x as a sound card with patchbox os.

I installed the patchbox os ( [[Beta] Patchbox OS image 2020-11-23](https://community.blokas.io/t/beta-patchbox-os-image-2020-11-23/2433)) on my rpi4.

Connected the usb audio interface and chose the following settings in the jack config:

default soundcard - USB  
samplerate - 48khz (this is also setup for the dr40x)  
buffer size - 128  
period - 2

The audio interface is connected and powered via the USB port of the rpi4.

When I test run in supercollider on the rpi4 I can hear something but very distorted.  
Any hint?

Thanks in advance,  
best regards,  
Sebastian

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<div class="post-metadata">

**Author:** ![Sn\_Lx](https://community.blokas.io/user_avatar/community.blokas.io/sn_lx/32/1913_2.png) [@Sn\_Lx](https://community.blokas.io/u/Sn_Lx)\
**Post date:** [May 21, 2021, 12:28pm UTC](https://community.blokas.io/t/usb-audio-interface-how-to-setup-correctly/3008/2 "2021-05-21T12:28:46Z")

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… or has anyone a working audio interface together with patchbox and rpi?

Could you share the model, your settings and how you power it?

Thanks in advance,  
Sebastian

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<div class="post-metadata">

**Author:** ![Giedrius](https://community.blokas.io/letter_avatar_proxy/v4/letter/g/6a8cbe/32.png) [@Giedrius](https://community.blokas.io/u/Giedrius)\
**Post date:** [May 24, 2021, 7:25am UTC](https://community.blokas.io/t/usb-audio-interface-how-to-setup-correctly/3008/3 "2021-05-24T07:25:06Z")

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Try using 512 or 1024 buffer size for USB audio cards.