asked Jan 20 at 19:15 by Netovarisch (11)

edited Jan 22 at 18:15

Hi, the problem is... When I connect the guitar processor (Headrush pedalboard (44Hz)) and play live or record it doesn’t matter, I put the buffer size 128 crackles begin, ok, I put the auto sample rate Bitwig(44hz) sets 256 and all the same after 10-20 minutes crackles and clicks begin. CPU load 10-20% MAX. In this case, the project is empty. Only one track audio. For the sake of the experiment, I also played in Logic pro X with a buffer size of 128 for about an hour and no artifacts occurred even once. What could be the problem? With VSTi 256 is enough for me, but with audio I got used to 128 and even 256 would fit, but Bitwig with 256 it crackles. Ps. Output: Zoom UAC2(44Hz) Macbook pro 2015 i7 16gb MacOS 10.15.2( all programm closed besides Bitwig) Bitwig 3.1.2(on earlier versions it was the same problem)

/Sorry for bad English.

I noticed the following feature. When the crackling starts, I change the sample rate from 44hz to automatic mode and the crackle disappears( for 10 minutes) when the crackle appears again, I change back from automatic mode to 44. And so around the circle. So the problem lies in the sample rate but how to solve it


answered Jan 22 at 18:15 by Netovarisch (11)

Hi (Not an audio expert) Have you tried using an „Fx grid“ device? Insight the grid the sampling rate is 4x higher I learned. To get your signal in you can use Inside the fx grid the module „audio rate“ or „hw instrument“ as input signals instead of the normal audio in module. And then just link it to the audio out module. And the fx grid may need a neutral container device-a.e An instrument layer or so.. Here's a visual- replaced FX Grid with Polygrid and added a peak limiter- May not resolve your problem but get a hint whats the role of the sampling rate


answered Jan 23 at 08:02 by former (130)

edited Jan 23 at 21:29

No, I have not tried this method. Thanks for the advice, but this way complicates the banal process. I need as in any DAW. Plug and play.

  — (Jan 23 at 09:59) Netovarisch

Hi Netovarisch,

when you change sample rate, you actually restart audio driver. I guess you can obtain the same effect just leaving the sample rate as is and restart the audio system.

I do not have experience with Mac: I'm a Linux user and with my interfaces, both a Behringer XR18 and a MOTU Ultralite AVB, have no problems recording in similar situation... actually I push even more and for longer and longer time: I use it in our rehearsal to play VSTs with my keyboards and sequencer and record drums, guitar, bass, voice at the same time, 48khz.

So looks to me something related to specific hardware, otherwise all mac users would have reported this behavior. Maybe related to what you have on the USB bus.

I understand with other DAW you do not have these troubles. I'm not saying that the problem is you and not Bitwig related.

Have you tried to contact Bitwig support?

Best regards,



answered Jan 23 at 12:31 by fsciarra62 (850)

Thanks for the answer. I haven’t written in support yet.

  — (Jan 23 at 14:52) Netovarisch

have you tried to simply stop and restart audio engine, without touching sample rate? Fabrizio

  — (Jan 23 at 15:03) fsciarra62

Hi, Another small basic thing: do you anyhow limit the volume? You need an compressor or peak limiter at the end of audio processing.


answered Jan 23 at 19:05 by former (130)

I forgot to mention it. Yes, of course I control the input signal levels. -10 dB comes out of the guitar processor and the audio track is -10dB.

  — (Jan 24 at 08:09) Netovarisch

I wrote in support and I think I solved the problem. I created an aggregated device from headrush and zoom and the crackle was gone! I quote support: «the problem is using different devices as input and output. Their sample rate will not be synchronized and eventually drift apart, creating digital distortion. You can try to combine them to one single aggregated device in the audio midi setup of macOS and then using this aggregated device instead.»

All thanks.


answered Jan 24 at 08:14 by Netovarisch (11)

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

Markdown Basics

  • *italic* or __italic__
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported



Asked: Jan 20 at 19:15

Seen: 106 times

Last updated: Jan 24 at 08:14