Hi

I've noticed this problem:

I have a Powerbook g4 15" OSX 10.4.4, a Lacie Firewire external disc, a Terratec Phase 24 firewire soundcard, an M-Audio Midisport 4x4 midi interface, a Clavia Nord Lead, a Waldorf Xtk, Yamaha Fs1r, Oberheim Matrix 1000 and an Yamaha 01V digital mixer. The digital out of the mixer is connected to the digital in of the soundcard. In Logic Pro 7.1, when I record the stereo out of the mixer thru the digital cable (spdif) into the soundcard I get cracks and pops. I'm always recording to the external disc (7200rpm). I've tried the Powerbook's hard disk and I get the same problem. Usually the recorded file sounds good at the beginning, but after some minutes it starts to have those cracks and glitches. And I'm sure they're recorded. It´s not a playback problem. I'm recording at 24bit 44100hz. I've tried recording second time and it had no cracks and pops !
Does Logic need to play all the song before it is recorded ? Do I have something wrong on my preferences ? Is this a bug ?

I've also noticed that when I use Kontakt 2 and I play a song for the first time, as soon as the song pointer reaches the Kontakt notes Logic stops with the following message: " CoreAudio System Overload.The audio engine was not able to process all required data in time.(-10011)". When I play the song the second time, Kontakt plays with no problems and the song doesn't stop. Is this related to the cracks and glitches problem in some way ?

What do you think ?

Thank you.

Alex

which device is sending the masterclock? How much RAM do you have? what is the speed of your Powerbook?
How much free space do you have on your system disk?

Try freezing all tracks then recording.

the Yamaha 01V is sending the masterclock, I have 1,5 gb RAM, the Powerbook is a G4 1,67 and I have 150 gb free space on my external disk and 30 gb on my system disk. I'm using only 2 virtual instrument tracks with Ultrabeat and Exs24 with a simple 8 sounds drum box, and a reverb plug-in. Why do I have to freeze with such a simple setup ? I had a PC pentium 800hz with 512 RAM and never had this kind of problems...

The cracks and pops definitely sounds like a master word clock sync problem. Are you sure that your digital audio card is in 'external' sync mode? Try swithcing it so that the card is in internal sync and the O1/V is in external sync.

The Kontakt problem is most likely unrelated. If it plays back fine the second time this is most likely because the samples are not fully loaded into memory until the second time and the first time is causing VM (virtual memory) page faults. How much memory do you have in the powerbook?

the Yamaha is set to internal and the sound card to external. I'm sure about that. if I switch it the Yamaha no longer sends thru the digital output and the soundcard doesn't receive any signal.
well...in fact I didn't connect the digital stereo out from the soundcard into the Yamaha mixer...do you think I must have the 2 cables connected?

regarding the Kontak, what do you mean by "memory" ? I have 1,5gb ram and this happens even if the Kontakt is loaded with only one simple and short sample...

anyway, thank you for your help.

ok this sounds like a buffer problem may be you buffer setting is too low

so you can look under audio menu
select hardware driver settings and then
select driver and increase your buffer settings to about 512
that should work

Also in the Power saving preference set the cpu to the highest performance setting.

the buffer was always 512 and I even tried with 1024 and the problem persists. the cpu was also always on the highest performance setting...

do you know if it has something to do with :

1 - delay compensation ?

2 - having the two digital cables connected ( I only have one connected from the out of the mixer to the in of the soundcard) ?

It is not definitely a cpu, buffer or ram problem, I think...

It is not delay compensation. Why not connect both Digital cables and try inverting the master and slave relationship between the audio device and the Mixer?

And verify everyone agrees to work at the same bit/KHz (both on the yam and in the mac, in logic, in audio MIDI setup and the sound pref panel).