Jump to content
s4n1ty

Mark IV model loss of gain after extended playing session

Recommended Posts

 

 

ok so after reading a few replies I had an idea and I'm fairly sure I've narrowed down the problem, which is a specific type of setting on the amp model. I typically run my bass and middle at zero which is demonstrated in the following pic https://www.dropbox.com/s/ypdg86eyr89vvwt/Screen%20Shot%202017-07-24%20at%207.16.43%20PM.png?dl=0 . I decided to change the bass and middle setting because i read somewhere that these act Pre gain or at least before the power amp and kind of act like a filter for the distorted sound before it hits the power amp. I changed the setting to this https://www.dropbox.com/s/v9pbcq661dzb5ee/Screen%20Shot%202017-07-24%20at%207.17.36%20PM.png?dl=0 I had this patch with the bass and middle at 5 going for a solid 2 hours with no noticeable change at all. i reverted my setting back to the previous with the bass and middle at 0 and guess what? the bug cam back... after an hour the patch was completely dead, so for lollipop and giggles i moved the bass slider slightly and the patch came right back to life. It seems there is a bug in having the bass and or middle at zero position, I'll try again with it at a very low setting and see what happens but i think this is where the bug is. I think this would it would explain why most people don't have a problem with it or don't notice it?

Good troubleshooting. Very interesting. I generally cut back my mids and bass... but then again I run a dual rectifier so I probably wouldn't have noticed.

But props for investigating the matter it sounds like you at least have a handle on it. 

Share this post


Link to post
Share on other sites

Here's a little more detail about a similar bug I can recall on the HD, from a private conversation I had with forum member hurghanico:

 

Part of what hurghanico said in January 2015:

 

you were already kind in reporting to me that you also have encountered the problem that the audio fades out with the Fireball when low mids and highs are respectively at 0/100/100 ..

to me the problem recurs every time I set the Fireball controls as above (I'm not interested at all in those particular settings, but only to understand if my device has a hardware problem)..

 

I responded:

 

Yea. I can reproduce this. Only it's not just 0/100/100.

 

After messing with it for a few minutes, I was able to get the disappearing sound at 0/100/88. But only when bass is adjusted first, then mid, then treble. And to get the sound to come back without switching presets, I could decrease the mid control by 1. Doing this also seems to have an effect on when the sound disappears subsequently, which was now 0/100/97. Very weird. Through all this I never touched any other controls except bass, mid, and treble. I should also mention when switching presets, I switch to a blank one and then back to the fireball one.

 

There might be some public postings on the HD forum if one cares to search. I haven't.

In any event, it seems like something got transferred over from the HD. I'm not certain at all if they even fixed this bug in the HD.

Share this post


Link to post
Share on other sites

I've just tried it again and tweaking the mid knob did not restore sound but bass did so I've left it with mid on default and bass on 0 to see what happens.

 

Craig

Share this post


Link to post
Share on other sites

Yeah ticket was lodged a few days ago they want me to update firmware to 2.21 and see if it still happens before they go any further. I know it will happen again. I want to try a few other amp models and see what happens too. Also it's worth mentioning i ran the patch with bass and mid at 1 and left it on overnight and the patch was fine in the morning.

Share this post


Link to post
Share on other sites

Round 3 currently under way.

Set up a patch with the zeroed out bass & mid and went to a BBQ 3 hours ago, will report back upon return (bout 3 hrs.)

Share this post


Link to post
Share on other sites

And... I'm back with the results...

Picked up guitar, turned volume up, and COMPLETE SILENCE.

Like CraigGT as soon as I nudged the bass the sound "sputtered abruptly back to where I left off.

Something strange is going on line 6

I am on version 2.20

Share this post


Link to post
Share on other sites

Cool well i'm glad i don't have a dud unit. Is anyone that replicated the dead patch results running 2.21. I'm going to update to 2.21 regardless and run through the process again so i can comfirm with line 6 that is still happens on 2.21.i'll also try to link them here

Share this post


Link to post
Share on other sites

Mine is on 2.21 already.

 

Craig

 

Cheers mate, and thanks everyone else for helping me.

  • Upvote 1

Share this post


Link to post
Share on other sites

I have a patch for the Mark IV Lead with bass on 0 and I never experienced the problem you're having. FW 2.20.
I'm following this thread and as a precaution I will put my bass to 1 :D

Share this post


Link to post
Share on other sites

Cheers mate, and thanks everyone else for helping me.

No problem, it's been an interesting one, hopefully there's enough information now that Line6 will be able to recreate the problem and get a fix in.

 

Craig

Share this post


Link to post
Share on other sites

I can confirm the same issue using the Cali IV Lead with a Variax connected via VDI. (Helix Rack - FW 2.21)

 

I set up a patch with just the Cali (Amp + Cab), set Bass and Middle to 0, and left it for about an hour. I tweaked it to fairly high gain and adjusted the EQ to get a fuller sound. It went from heavy gain to practically zero, then a quick flick of the Bass parameter and all was fine again.

 

Just thought it might be interesting to test if it was input-specific, but I guess not.

 

Weird one!!!

Share this post


Link to post
Share on other sites

Glad to see some real troubleshooting going on here!!!

 

This will in turn help L6 nail down the problem faster, reach a solution faster, and allows them a little more time in giving us new features.

Share this post


Link to post
Share on other sites

Great work guys, @s4n1ty in particular :)

 

Has your "sanity" returned? ;)

 

Yes mate it has, i was worried i had something wrong with my unit. such a relief

Share this post


Link to post
Share on other sites

Great job!

 

I ipwish I still had my Mark IV head to see if the real deal would do that too! ;-).

 

Seriously, I did have to take it in for repair more than once with the common bad LDR problems. Maybe Line6 modelled it *too* accurately ;-(

Share this post


Link to post
Share on other sites

Funnily enough I noticed that the Helix Native known issues mentions that the Cali IV fades away!

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...