Steve theres a DC component in your output !!! , direct current will cause this , some digital mixers and recorders will build up a DC offset that can cause this ( I thought most dc offsets were static not varying ??? might be wrong )
I dont know what may have caused this to happen in the first place possibly some dc leakage from some source in the signal chain when recording , did you use the same device on these tracks ???

Hope this helps
Later
Buzz

the thought had also crossed my mind about dc, when I put the hpf in the chain. Is seems to only be on the snare, and the bass. I routinely mic snare top and bottom, but it still occurs occasionally, and on different channels. What are some ways to fing the culprit. Could it be ad conversion on my adats?

:) Hey Steve, do an experiment where you hook everything up, mics and all, set levels and roll with out making sounds. Then, look for a signal on a spectrum analyzer. That slow movement could be a DC peak of a very large wave, or it could be a bad cap in the phantom, mic pre, input strip, any number of places. Or even a subsonic vibration. You have to track it down item for item. Also make sure there are no other influences, like an open channel, or generator, midi note, or something from your software.

Good luck!

--Rick

Ha HA! I have just learned that there is a steel foundry 1/4 mile down the street. There are really big machines there, I think the is what the mic's are hearing.

Originally posted by Steve@speedRiverStudios:
Ha HA! I have just learned that there is a steel foundry 1/4 mile down the street..what the mic's are hearing.

:) Put the base of your mic stand on a pillow(s), and see if it goes away.

--Rick

Good idea Rick! I have to wonder if it would work because the mic I used to test this, was a c-414 in a shock mount. I will try a foam pad for non isolated mic's as I think this will look a little better and accomplish the same function.

Thanks, and hope your holiday is going well! canada just had our independance celebration on the 1st!

If you have a tri-pod stand, take a roll of toilet paper and put one on each leg. I had some made out os a low-memory, heat and chemical resistant foam material. They work great.

thanks sheet. Ido have tri-pods,but they stay with the live rig,as i find they take up too much floor in my small studio. Great idea!

Originally posted by sheet:
If you have a tri-pod stand, take a roll of toilet paper and put one on each leg...

...And you never run out of paper when you need to....awwww Sheet, LOL!!! Couldn't help myself LOL!!! :D :D

--Rick

Steve, if it was the steel foundry, why did you only get it on snare and bass?
Jonas

Jonas. I have only one response to that:
:D :D
You point out the most painfully obvious thing, and now I have to start over!
Thanks! I feel dumb for not even having thought of that, but I haven't spent a lot of time on it either. When I do, and when I solve the problem, I will update this thread and let you all know!