Digital static when bouncing out of Logic

guyslogic wrote:
All my drivers are up to date.
I record at 44.1 and 24 bit. I bounce out at 44.1 and 16 bit.
I'm using core audio. My mixes are bounced out through the main outs of my Motu 893mk3. I'm monitoring through an analog mixer but not mixing through it at all.
My sound preference output is set up for my Motu 896mk3 as is my motu audio midi set up outputs.
I do keep the aggregiate device on all the time because I run two 896's most of the time.

I see several possible causes.

First, are the MOTU's working well except for this problem?
I would do a factory reset on both of them, that often cleared up any problems relating to the MOTU hardware.

The MOTU Mk-II reset looks like this, don't know if the MK-III is similar.
---------------------------
Disconnect the firewire cable from the 828mkII
Press the Setup knob
Turn the Setup knob all the way to the right
Press the Select knob
Press the Value knob
Power off the interface and plug the firewire cable back in
Power the interface back on
----------------------------

I never set the Mac's sound preferences to use the pro audio hardware, I know it's supposed to work but prefer to use Mac built-in-audio for all default outputs and leave the pro audio hardware for the exclusive use of Logic.

Last, in Logic, when bouncing out, don't use the aggregate device, select the main MOTU unit.

(I see there's a v1.06 firmware update for the Mk 3. Don't know if they list fixes/improvements included. I think the firmware update and new drivers are made to only work with each other.)

pancenter-

Good advice from my centre-panned friend.

(If you changed your alias to PancenteR, you'd be -3dB compensated 😉

Try bouncing to different file formats (aiff, wav, caf etc) and sample rates.
Do you get static on all these, or only some?

guyslogic wrote:
I very seldom bounce in real time. It doesn't seem to matter when I have other problems so I haven't tried it. I'll have to try that.

If you're running any rewire objects, those must be bounced in real-time.

Was thinking about my earlier post:

You had written:

I'm using core audio. My mixes are bounced out through the main outs of my Motu 893mk3. I'm monitoring through an analog mixer but not mixing through it at all.

I responded with a bunch of stuff about drivers, not choosing aggregate device, etc... I saw "bounced out through the main outs of my MOTU 828Mk3" and was on the wrong track.

I'm not so sure that makes any difference, I always thought it did but there was a long discussion on another forum that basically proved (or seemed to) the audio drivers and/or audio device choosen doesn't make any difference, drivers are out of the equation as it's all math internal to Logic.

When Logic bounces it uses a single core, a non-realtime bounce <should> take as much time as it needs to complete the bounce without overloading the core.

I guess next question is, are you're using a lot of processor intensive plugins... like "Space Designers"?

pancenter-

I had this same problem today for 6 grueling hours! I just figured it out. This may not be your problem, but it was for me.

I was getting a static clip/hiss only for the last 25 seconds of the song. It never happened during playback of the track while Logic was open, only after bouncing it to an MP3/AIFF. I also tried Bouncing it in Real Time and it made the hiss that time during the recording.

I think I bounced the same song about 25 times before I decided to do this.

Go To: File --> Export --> All Tracks as Audio Files (Or Open Apple + Shift + E).

Once I did this, it put 16 AIFF audio tracks on my Desktop and names each one the name of the tracks in the Logic Project (ie Kick1, Snare1, et al). I opened them all using Quick Time and listened to each track's last 30 seconds to see if there was any feedback and Eureka!, it was only on one track (in this case an Bass Line3).

I opened the project again and went to the track inspector for Bass Line3 and noticed that I had my AutoFilter CutOff and Resonance maxed out at 100% each and this was causing the problem. I lowered them and then Bounced it again.

It finally came out just right!

Hope this helps...

What format are you bouncing, and what are you using to listen to the bounce?

Drivers up to date? Using Core Audio?

my friend had this problem when using a mackie spike. no pun intended. what are the sound preferences on the mac and your soundcard, assuming you are using an external soundcard.

What I believe Bee Jay was asking you was — when you Bounce, what options do you choose in the dialogue box? The Audio files that result must be in a particular format; which one?

do you get the static when bouncing offline and/or realtime too?

JG