Audio stutter & dropouts related to MOTU plugins

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This forum is for seeking solutions to technical problems involving Digital Performer and/or plug-ins on MacOS, as well as feature requests, criticisms, comparison to other DAWs.
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edb
Posts: 8
Joined: Wed Jun 08, 2005 10:01 pm
Primary DAW OS: MacOS
Location: Austria

Audio stutter & dropouts related to MOTU plugins

Post by edb »

Hello folks,

i am currently working on a new project with DP 5.11 involving 5-6 aux-tracks as mix-busses. Now some strange things happen which re reproducable.

1. When i stop playback sometimes cpu-load goes up to almost 90% when it is around 30-40% during playback. This is due to everb in the reverb bus not getting any audio signal after stop. When i disable the plugin (when stopped) the cpu gets back to normal.

2. Same thing happens with Preamp1 on a vocal track on cut-out parts of the track (no audio signal). I can avoid this by inserting some soudbites with no or just low noise signal in the spaces)

3.Basically the same happens with Delay and other plugins inserted into aux-tracks.

So far i can say that this ONLY happens with MOTU-Plugins. With AU-Plugins there is no problem at all. The setting "always run in realtime" sometimes helps, sometimes not.

Funny thing is, it does not happen all the time. BUT it seems that the more plugins/cpu-power i use its more likely to happen.
I am almost sure that this came with Version 5.11.

This behaviour is VERY ANNOYING! It simply brings you out of creative workflow and wastes time needed to work around. :(

So, what is the situation here? Does someone have the same experience? btw. this happens with Intel & PowerPC machines.


Another positive thing i found out:

I am mixing a project recorded in Cubase SX3. I opened it in Cubase Studio 4 (we had to buy it to continue working on the files). After some fiddling around i came to the conclusion that Cubase just doesnt get it. On one hand it has some nice features (Media-Browser, ...).
But the Workspace is (for me) not as productive as DP. It can‘t use AU-plugins. The included plugins lack sound-quality. There is no Multiband Compressor. And for sure theres nothing that compares to Masterworks-EQ (which is in my opinion one of the best Software-EQs you can have).

So i decided to export the tracks to DP to continue working. Then i found out that there is no way to export tracks, so i had to bounce each track seperately (took one hour). GREAT... NOT

The real surprise came after i finally had all tracks in DP and pressed play (without any mixing and stuff).
:shock: WHAT THE....? Is it just me? No, we were 2 guys sitting in front of the speakers and instantly recognised, that the sound that came out of DP had SO MUCH more clarity and depth that we couldn‘t believe it in the first moment. Switched back to Cubase listened again. Back to DP.
Yeah, really. It seems that the Algorithm in the MOTU Audio Engine, which is basically a Software-Reproduction of a mixing desk, is much more advanced. It reminds me listening to tracks comparing a behringer to a mackie mixer. What a difference!
The resulting bounces (after mixing) also are very different. And you can still hear much more clarity, even in a resulting 16bit file burned to a CD.

So DP is THE Killer-App regarding sound-quality especcially when you do mixing in the software-domain and dont have that SSL-Console standing around in your studio.

Whats your experience?
Regards!
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vier-personen
Posts: 256
Joined: Thu Nov 02, 2006 8:39 am
Primary DAW OS: MacOS
Location: central europe

Re: Audio stutter & dropouts related to MOTU plugins

Post by vier-personen »

edb wrote:Hello folks,

i am currently working on a new project with DP 5.11 involving 5-6 aux-tracks as mix-busses. Now some strange things happen which re reproducable.

1. When i stop playback sometimes cpu-load goes up to almost 90% when it is around 30-40% during playback. This is due to everb in the reverb bus not getting any audio signal after stop. When i disable the plugin (when stopped) the cpu gets back to normal.

2. Same thing happens with Preamp1 on a vocal track on cut-out parts of the track (no audio signal). I can avoid this by inserting some soudbites with no or just low noise signal in the spaces)

3.Basically the same happens with Delay and other plugins inserted into aux-tracks.

So far i can say that this ONLY happens with MOTU-Plugins. With AU-Plugins there is no problem at all. The setting "always run in realtime" sometimes helps, sometimes not.

Funny thing is, it does not happen all the time. BUT it seems that the more plugins/cpu-power i use its more likely to happen.
I am almost sure that this came with Version 5.11.

This behaviour is VERY ANNOYING! It simply brings you out of creative workflow and wastes time needed to work around. :(

So, what is the situation here? Does someone have the same experience? btw. this happens with Intel & PowerPC machines.

this sounds exactly like the problems I have described in this thread - http://www.motunation.com/forum/viewtop ... cpu+spikes though I never figured out which plugin causes what, I think it is related to how much cpu power is used.
we should contact motu at http://www.motu.com/techsupport
DP 5.12/OS X 10.4.9/MacBook C2D 2.0 1GB Ram/RME Fireface 400
Dave Bourke
Posts: 784
Joined: Sat Oct 16, 2004 10:01 pm
Primary DAW OS: MacOS
Location: Dublin, Ireland

Post by Dave Bourke »

What you're describing is called "denormalisation." You can get a brief overview of the problem in plain English here:

http://www.digitalfishphones.com/main.p ... &subItem=6

It was fixed in DP5.12.

Kind regards.
Dave Bourke
– ideation –

Mac Pro Quad Xeon 2.66 GHz, 5 Gb, OS X 10.5.8, iMac 24" 2.4 GHz Intel Core Duo, OS X 10.6.2, Mac G4 dual 800 MHz Quicksilver, DP 7.11, PCIe-424/24i, UAD-2 Quad/UAD-1e, PowerCore Firewire.
User avatar
edb
Posts: 8
Joined: Wed Jun 08, 2005 10:01 pm
Primary DAW OS: MacOS
Location: Austria

That was the Solution!

Post by edb »

Great! I installed the update and everything runs smooth now!
Thanks!
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