Poping and crackling in Bias FX

  • Hello

    I get pops and cracks in Bias FX. I tried numerous solutions, both 32 and 64 bit, standalone and VST version, various buffer and sample rates and Im always getting some crackling sound. Im using Focusrite scarlett 2i4 2nd gen as my audio interface with up to date drivers. Can this hardware be a problem related to focusrite or am i missing another solution to this issue?

  • Popping and crackling are almost always driver or sample rate/buffer issues. You usually either have to get a better driver or keep upping the buffer until they go away. Sometimes it is the sound card driver or the computer that is the limiting factor.

  • I already tried the buffer thing and it didnt help. The problem doesnt seem to be focusrite related. I used gt-1000 as soundcard and it still crackled. It was playing good only when i bumped up the buffer all the way up to 2048 on the GT. But that gives way too much latency.
    My PC is decent, i7 cpu and 16GB RAM so this cant be the issue. BIAS disortion sounds great, way better than my GT-1000, but the crackling is really annoying

  • Shrug. Sorry but that is a;most always root cause. PCs are a pain like that. You could try checking connections and levels to make sure you don't have a bad cable/connection or level problems but if you are getting it from multiple interfaces, I am guessing it is something to with your machine/OS and/or its configuration.

    The only other thing I see this kind of symptom on is like clock mismatches but your setup does not seem that complex... you could make sure your driver setting is not out of sync with the DAW/app. If you are using something ASIO4all I guess you should check to make sure its settings are aligned with the DAW/app. It has been a long time since I bothered with audio on a PC.

  • A2

    Run this for a bit and show what you get


  • this is what i got after 12 mins of latency mon. There is a buffer underrun problem but im not exactly sure what to do next with it:


    Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. At least one detected problem appears to be network related. In case you are using a WLAN adapter, try disabling it to get better results. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
    LatencyMon has been analyzing your system for 0:12:27 (h:mm:ss) on all processors.


    Computer name: DESKTOP-4TURTRM
    OS version: Windows 10 , 10.0, build: 17763 (x64)
    Hardware: Precision M6600, Dell Inc., 04YY4M
    CPU: GenuineIntel Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz
    Logical processors: 8
    Processor groups: 1
    RAM: 16264 MB total


    Reported CPU speed: 2195 MHz

    Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.

    WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.


    The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

    Highest measured interrupt to process latency (µs): 1996,70
    Average measured interrupt to process latency (µs): 17,851435

    Highest measured interrupt to DPC latency (µs): 1963,70
    Average measured interrupt to DPC latency (µs): 4,097029


    Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

    Highest ISR routine execution time (µs): 132,170387
    Driver with highest ISR routine execution time: i8042prt.sys - Sterownik portu i8042, Microsoft Corporation

    Highest reported total ISR routine time (%): 0,004790
    Driver with highest ISR total time: i8042prt.sys - Sterownik portu i8042, Microsoft Corporation

    Total time spent in ISRs (%) 0,004925

    ISR count (execution time <250 µs): 12418
    ISR count (execution time 250-500 µs): 0
    ISR count (execution time 500-999 µs): 0
    ISR count (execution time 1000-1999 µs): 0
    ISR count (execution time 2000-3999 µs): 0
    ISR count (execution time >=4000 µs): 0


    DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

    Highest DPC routine execution time (µs): 1621,124374
    Driver with highest DPC routine execution time: ndis.sys - Specyfikacja NDIS (Network Driver Interface Specification), Microsoft Corporation

    Highest reported total DPC routine time (%): 0,00380
    Driver with highest DPC total execution time: rspLLL64.sys - Resplendence Latency Monitoring and Auxiliary Kernel Library, Resplendence Software Projects Sp.

    Total time spent in DPCs (%) 0,015492

    DPC count (execution time <250 µs): 70361
    DPC count (execution time 250-500 µs): 0
    DPC count (execution time 500-999 µs): 175
    DPC count (execution time 1000-1999 µs): 1
    DPC count (execution time 2000-3999 µs): 0
    DPC count (execution time >=4000 µs): 0


    Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

    NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

    Process with highest pagefault count: settingsynchost.exe

    Total number of hard pagefaults 981
    Hard pagefault count of hardest hit process: 555
    Number of processes hit: 9


    CPU 0 Interrupt cycle time (s): 10,134722
    CPU 0 ISR highest execution time (µs): 132,170387
    CPU 0 ISR total execution time (s): 0,294311
    CPU 0 ISR count: 12418
    CPU 0 DPC highest execution time (µs): 858,441002
    CPU 0 DPC total execution time (s): 0,559407
    CPU 0 DPC count: 51734

    CPU 1 Interrupt cycle time (s): 5,120196
    CPU 1 ISR highest execution time (µs): 0,0
    CPU 1 ISR total execution time (s): 0,0
    CPU 1 ISR count: 0
    CPU 1 DPC highest execution time (µs): 144,057403
    CPU 1 DPC total execution time (s): 0,022141
    CPU 1 DPC count: 887

    CPU 2 Interrupt cycle time (s): 5,045213
    CPU 2 ISR highest execution time (µs): 0,0
    CPU 2 ISR total execution time (s): 0,0
    CPU 2 ISR count: 0
    CPU 2 DPC highest execution time (µs): 1621,124374
    CPU 2 DPC total execution time (s): 0,074887
    CPU 2 DPC count: 2962

    CPU 3 Interrupt cycle time (s): 5,430676
    CPU 3 ISR highest execution time (µs): 0,0
    CPU 3 ISR total execution time (s): 0,0
    CPU 3 ISR count: 0
    CPU 3 DPC highest execution time (µs): 80,888838
    CPU 3 DPC total execution time (s): 0,003340
    CPU 3 DPC count: 195

    CPU 4 Interrupt cycle time (s): 3,808937
    CPU 4 ISR highest execution time (µs): 0,0
    CPU 4 ISR total execution time (s): 0,0
    CPU 4 ISR count: 0
    CPU 4 DPC highest execution time (µs): 463,663781
    CPU 4 DPC total execution time (s): 0,039773
    CPU 4 DPC count: 1850

    CPU 5 Interrupt cycle time (s): 6,283173
    CPU 5 ISR highest execution time (µs): 0,0
    CPU 5 ISR total execution time (s): 0,0
    CPU 5 ISR count: 0
    CPU 5 DPC highest execution time (µs): 161,694761
    CPU 5 DPC total execution time (s): 0,029303
    CPU 5 DPC count: 2118

    CPU 6 Interrupt cycle time (s): 4,590650
    CPU 6 ISR highest execution time (µs): 0,0
    CPU 6 ISR total execution time (s): 0,0
    CPU 6 ISR count: 0
    CPU 6 DPC highest execution time (µs): 538,498861
    CPU 6 DPC total execution time (s): 0,053780
    CPU 6 DPC count: 3106

    CPU 7 Interrupt cycle time (s): 5,670951
    CPU 7 ISR highest execution time (µs): 0,0
    CPU 7 ISR total execution time (s): 0,0
    CPU 7 ISR count: 0
    CPU 7 DPC highest execution time (µs): 750,169932
    CPU 7 DPC total execution time (s): 0,143187
    CPU 7 DPC count: 7685

  • A2

  • It works ! The fix was simple afterall, just downloaded and installed all possible dell updates (bios,firmware,drivers) and it stopped crackling. Finally i can enjoy this app :)