Line In audio crackles when playback is running

Bug Description

I’m hearing a digital sounding crackle while monitoring and recording via the line input.
Crackling starts as a few pops, but as time goes on, it progressively gets worse.

It’s the cracking that sounds like the kind you get when latency from an audio interface to a computer is set shorter than it can handle.

Reproduction Steps

  1. I just simply plug the sound source (tried with different synths) to the line input, (with line monitoring enabled).
  2. Play the sound source.

Occurrence

Always

Found in

  • Version: 1.0.1
  • Build: 955

Attachments

3 Likes

Yeah, I get the input crackle too.

Hey @mat.on.the.moon and @catbeatsofficial , welcome to Backstage. :partying_face:

I’ve just changed this topic into a Bug report. Can you do me a favor and fill out the template that i’ve attached to your original message?

Since there are two of you noticing the same issue, i figured it’s probably best to treat this as a possible bug. :blush:

2 Likes

Bug Description

I’m hearing a digital sounding crackle while monitoring and recording via the line input.

Crackling starts as a few pops, but as time goes on, it progressively gets worse.

Reproduction Steps

  1. I just simply plug the sound source (tried with different synths) to the line input, (with line monitoring enabled).

  2. Play the sound source.

Occurrence

bug is reproducible: Always

Found in

  • Version: 1.0.1
  • Build: 955

I’ve updated the initial post of yours with the details you provided. By the way. What’s the external soundsource you are using in this particular case. The more details you can provided, the better :blush:

I used a Virus Ti2 an 0-Coast, a few iPad synths FabFilter Twin3, Cyclop, Hilda etc. :+1:

1 Like

Thanks, one last question. I’m guessing you are listening directly from the Tracker+ Line Out? And are not multitracking or anything at the same time?

1 Like

Yep that’s correct, I’m using the direct line out from the Tracker itself.

I haven’t spent much time with multi tracking into a DAW via the Tracker’s usb port so I can’t say much about that side of things.

1 Like

Just checking because the behaviour you describe is something that can happen when using USB and not starting things in the correct order or using the right samplerates / buffers.

But if it’s just line-in and line-out, this should definitely not be the case.

So to be exact, I am just using the Tracker only with no computer involved, as far as the iPad goes I’m just sampling its line output with a headphone adapter. The Tracker and iPad are not connected via midi, if I’m making sense

1 Like

Thanks! FYI my external sound source was a 1010music Lemondrop which I am sequencing with the Tracker+ via standard DIN-MIDI. It was occurring every time with this setup.

Note also when jamming with a friend the other day and them going into my input I had NO issue, in that case I also was NOT sequencing anything externally.

1 Like

I’m having this issue with Tracker+ as well with an outboard synth’s audio through the line-in, completely stand-alone, listening from the tracker+'s line out. Doesn’t seem to matter what synth I was using: for now I tried Roland JD-08 (both usb powered and battery powered) and Behringer Poly-D. Can try other equipment as well.

The crackling got worse after I enabled some filters on samples I was playing, which is when I noticed it first. The pattern I was testing this with had four sample tracks in use. It seems to mostly go away if I mute the sample tracks, or use the sample recorder (as nothing else is playing then).

*Did some more testing and edited the message accordingly: earlier I was using the tracker+ to sequence the outboard synths, but the crackling occurs without the sequencing as well.

1 Like

@here Thank you for reporting this bug. We are sorry you’re experiencing issues with the Tracker+. After some investigating we came to the conclusion it may be a hardware-related problem.
Everyone who encountered a similar issue, please fill out the RMA: https://polyend.com/rma-application-form/
We will contact you directly regarding the fix :slight_smile:

3 Likes

Oh! This is surprising as in my mind I was convinced it was a CPU thing with external sequencing and CPU couldn’t handle the input DSP with too much going on so assumed a firmware update would fix it. Interesting as I had a jam yesterday and had no issue but also wasn’t external sequencing, just sending a clock.

@here Update! After some investigation, we realized that it was in fact a firmware bug. We will do our best to resolve it and notify you when it’s ready.
Sorry for the mixup :slight_smile:

6 Likes

I updated the description to reflect the issue better.
Also here’s another side-effect of the same issue: Midi bug while using line input