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DJ'ing with Traktor Scratch

post #1 of 5
Thread Starter 
Hi all,

Not really editing, but this A/V Edit forum seemed the closest fit here.

I recently purchased a Sager NP8662.

Specs:
Sager NP8662 based off the Clevo M860TU
T9600 2.80 GHz 6MB 1066
nV GeForce Go GTX 260M w/1GB
4096MB DDR3 1066 (2 DIMMS)
2.5" SATA 500GB(7200rpm) HDD

For a couple of months now I have been trying to use a program called Traktor Scratch Pro that also includes an external USB connected audio card they call an Audio 8 DJ.

I have had problems from day 1 of attempting to use this application/hardware. The sound produced is like a distorted "crackles" type of sound. Sometimes it kind of goes with the beat (more crackles during heavy bass) and sometimes not. Sometimes it goes away for maybe 5 or 6 songs, turn off the laptop, come back the next day, boot up and there it is again. It is very random (at least random to my perception). Sometimes I can start disabling devices in Device Manager (and Services) and the problem goes away and I am thinking, YES, finally. Then a couple minutes later the problem returns. I have disabled every device and service possible and still this problem persists. I have tried grounding everything and I have tried a DI box. Nothing has worked. I have udated all drivers, flashed the latest BIOS, still no good.

According to a program called DPC Latency Checker my system should be able to handle real time audio. I have also tried every latency setting available in the Audio DJ 8 driver settings. It makes no difference.

I have tried Vista 64, Vista 32, and now I am on XP Pro (all legal copies of mine) and still the sound is distorted.
I have "googled" and ready many posta on this subject and tried everything mentioned by other users.

If I take the Audio 8 sound card and plug it into my desktop the sound is fine. If I take the Audio 8 and plug it into my wifes laptop the sound is fine. It seems only my laptop (NP8662) causes this problem to occur. I don't know if there is a known compatibility issue with my laptop or not.

I have of course been around and around with the vendor of the app/hardware I am trying to use (Native Instruments) and so far nothing. They just keep telling me there is a device I need to disable or a service I need to stop. Well I can tell you that after over a month of trying there is no device or service I have not disabled at least 10 times already and still the problem exists.

I am willing to try anything at this point. Any suggestions, something I have missed maybe, a system driver I need to install, anything. This is a new laptop, very expensive for my budget, and as of now it is useless to me and collecting dust.

If anyone has any ideas, no matter how obscure, I am willing to try. I am going to get a USB powered Hub this weekend to see if that makes any difference at all, though I am not expecting it to. If I look in Device Manager the Audio 8 soundcard is using less than the supplied amount of power to the USB port anyway.

Thanks for reading this extended post. I try not to bother people with these mundane issues, but I am beyond desperate. A lot of money spent and nothing to show for it.

Thanks,

bluesticky
post #2 of 5
post #3 of 5
Thread Starter 
Going to start reading now !

Thank you,

bluesticky
post #4 of 5
Random and really late, but i was browsing forums with Traktor in them.

If you have not fixed it at all, the crackles and pops are because your cpu is being crunched by data. You need to decrease your sample rate. (has a range from 41-96 khz) and/or increase the sample size. from 64-512. I have an old inspiron that would pop and cackle until i figured it out.

A small sample size crushes your cpu because it has to process many more batches. The sample rate decreases your latency which makes your cpu work faster. The conjunction of the two beats many a cpu into the ground.

RAM size has nothing to do with the sounds you hear.

i hope you've totally solved it before this post
post #5 of 5
Quote:
A small sample size crushes your cpu because it has to process many more batches. The sample rate decreases your latency which makes your cpu work faster. The conjunction of the two beats many a cpu into the ground.
Not quite true.

In general the smaller buffer you have, the less latency you will have, but the harder your CPU has to work yes. Whether this is a problem or not depends on how your computer is set up, thus my links above. Many computers if properly set up will allow you to work at rather tiny latencies without problem.

Sample Size is equivalent to buffer size in terms of data. Sample rate, is how many samples per second the AD/DA processes. While sample rate will decrease latency for a given sample size, that is because when sampling 96 thousand times per second you sample size that is the same as if you were doing it 44 thousand times per second holds less equivalent time as you need more than twice the data for every second now.

Quote:
RAM size has nothing to do with the sounds you hear.
Far to often wrong to say such a blanket statement. When dealing with playback or recording of audio, for most semi-pro to pro applications ram size will determine how much you can have loaded into memory at any given time, vs how much needs to be read from disk into memory first. The larger the memory buffer, the more likely you are not going to have problems with your disk keeping up, especially when dealing with multi-track audio. You can have dropouts that are related to not being able to read or write data to disk fast enough, just like you can from a CPU not being able to keep up with processing audio(Or being able to keep up with processing audio and handle reading from disk which also takes some CPU time as well).

Now in general one would hope that any modern hard drive would be able to keep smooth playback of 4 to 6 tracks, which I would guess is most of what you deal with in traktor not being a DJ myself, without issue, but if you have lots of stuff loaded into a small amount of memory, and especially are playing audio off your system disk, this can be questionable. Again it goes into how you have your computer set up, and primarily is it set up properly for the task you have set to it.

Seablade
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