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Author Topic: M-Audio MicroTrack 2496 - *actual* real-life experiences thread  (Read 153498 times)

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Offline MattD

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #240 on: September 22, 2005, 05:57:29 PM »
You could also just hash the original files instead of FLACing them. However, the inversion test is easier to do if you're not 100% sure you started and ended on the same sample for each file. A hash would be very different, but the inversion would probably still be close to flat, and you'd know to adjust it in one way or the other.
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Offline zultar

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #241 on: September 22, 2005, 05:59:38 PM »
once both .wav files are on your computer, open them up in a .wav editor.  Find a drum beat or something, and zoom real far in.  You need tro trim both files so that start and end in EXACTLY the same place.  once that is done, you can invert both channels of one file and mix it with the other file.  if you get an absolutely FLAT line of silence, than the files were identical, any spike from the silence shows where the files were different.

Once you have two aligned files of the same length you should just FLAC them both and compare the fingerprints.  The fingerprints are the MD5 hashes of the PCM data in a canonical format.  That's gotta be easier than inverting, mixing, and comparing.


I got my MicroTrack today also, but it sounds like I am going to have to wait for new firmware to do a test.

That bites about the peak hold.  A good peak hold waits until you push a button to reset it.  Everyone nag them to add a mode where the peak holds until you push 'del' or something.


Exact Audio Copy also has a wav compare function.  it takes into account any offset between the two files, saving you the trouble of having to line them up perfectly.  once you run wav compare, all you have to do is look for any error messages stating "different samples", disregarding any offset errors.

EDIT- im pretty sure EAC only works for 16/44.1 wavs though.
« Last Edit: September 22, 2005, 06:04:42 PM by zultar »

Offline John Kelly

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #242 on: September 22, 2005, 06:08:11 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?
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Offline prof_peabody

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #243 on: September 22, 2005, 06:14:59 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?

A 1 bit difference between two files could result in very different md5 hashes. 

see this for an example:

http://en.wikipedia.org/wiki/Md5#MD5_hashes
« Last Edit: September 22, 2005, 06:17:08 PM by prof_peabody »

Offline CliffClavin

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #244 on: September 22, 2005, 06:15:36 PM »
On March 21, 1947, the 122nd Street police station in New York City received a call from a man claiming that there was a dead body at 2078 Fifth Street Avenue. The police knew the house, a decaying three-story brownstone in a run-down part of Harlem, and its inhabitants, Langley and Homer Collyer, two eccentric recluses. No one could recall having seen Homer for years. There were even rumors that his dead body was I the house. Langley was seen only when he went out on furtive sorties, usually after midnight. He earned himself the nickname of "the ghostly man." The day after the call, patrolman William Barker broke into the second-floor bedroom. What he found there took his breath away. The room was filled from floor to ceiling with objects of every shape, size and kind. It took him several hours to cross the few feet to where the dead body of Homer lay, shrouded in an ancient check bathrobe. The autopsy revealed that Homer had not eaten for several days and had died of a heart attack. There was no sign of Langley, and the authorities immediately began to search for him. It took 3 weeks to shift through the estimated 136 tons of junk with which the house was filled. The bizarre collection of objects included 14 grand pianos, two organs, and a clavichord; human medical specimens preserved in a glass jars; the chassis of a Model-T Ford; a library of thousands of medical and engineering books; an armory of weapons; the top of a carriage; 6 U.S. flags and one Union Jack; a primitive X-Ray machine; and 34 bank deposit books with the balance totaling $3,007.18. Gradually the story of the Hermits of Harlem unfolded, and the presence of some of the contents of the house began to be explained. Homer Lusk Collyer and Langley Collyer were born in 1881 and 1885 respectively. Their father, Dr. Herman L. Collyer, was an eminent gynecologist and their mother, Susie Gage Frost Collyer, a well-born lady noted for her musical abilities. The family set up home at 2078 Fifth Avenue in then-fashionable Harlem. But around 1909 Herman left. When he died in 1923, all the furniture, medical equipment, and books that he had collected over the years were taken back to Fifth Avenue and crammed into his wife's house. Langley had been trained as an engineer; Homer became a lawyer. Both were eccentric in innocuous ways - increasingly so when left to fend for themselves after their mother's death in 1929. Langley apparently never had a job, but was always tinkering with inventions, such as one for vacuuming the insides of pianos, and attempting to make the Model-T engine run via electricity. In the 1930's Homer became blind, crippled with rheumatism, and progressively paralyzed. Langley devoted the rest of his life to caring for him. Distrustful of doctors, but with access to his father's extensive medical library, Langley devised odd "cures" for his brother's illness, subjecting him to regimes as a diet of 100 oranges a week, black bread, and peanut butter. The house was already cluttered with the content of two large homes, but Langley stuffed it with yet more objects picked up on his nightly excursions. After all windows were boarded up, and the gas, electricity, and water cut off, one small oil stove served all their cooking and heating needs; Langley collected water from a standpipe four blocks away. On more that one occasion thieves tried to break in to steal the fortune that was rumored to be kept in the house. Langley responded by building booby raps, intricate systems of trip wires and ropes that would bring tons of rubbish crashing down on any unwary burglar. A honeycomb network of tunnels carved out in the mountains of junk enabled Langley to grope his way to where Homer sat. As the world's newspapers revealed the secrets of 2078 Fifth Avenue, there was a final, grisly twist. On April 8, Artie Matthews, one of the workmen commissioned t clear the place, raised a pile of newspapers, tin boxes and other debris near a spot where Homer has been found. His horrified gaze fell first on a foot, then the remains of a body. It had been gnawed by rats, but there was no doubt that it was Langley Collyer. Langley had died some time before his brother, suffocated under the garbage that had cascaded down upon him when, he had sprung one of his own burglar traps. Homer's death was now easily explained. Blind and paralyzed, and totally dependent on Langley, he had died of starvation and shock. The house was gradually emptied and its more valuable contents sold at auction. But despite the Collyer brothers lifelong hoarding, the 150 items raised only $1,800. The house too has now gone. Condemned as a health and fire hazard, number 2078 Fifth Avenue was razed to the ground. Today it is a parking lot.


-Cliff

Offline John Kelly

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #245 on: September 22, 2005, 06:16:48 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?

A 1 bit difference between two files could result in very different md5 hashes. 

Yeah but wouldn't that mean I couldn't have a completely flat wav form?
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Offline prof_peabody

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #246 on: September 22, 2005, 06:18:51 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?

A 1 bit difference between two files could result in very different md5 hashes. 

Yeah but wouldn't that mean I couldn't have a completely flat wav form?

Is there any header info in the WAV files?

Offline John Kelly

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #247 on: September 22, 2005, 06:19:54 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?

A 1 bit difference between two files could result in very different md5 hashes. 

Yeah but wouldn't that mean I couldn't have a completely flat wav form?

Is there any header info in the WAV files?

Quite possible.  How would I go about discovering if there is?
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Offline prof_peabody

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #248 on: September 22, 2005, 06:22:35 PM »
Ok, well here's an odd thing.  Inverting the JB3 recording and mixing it into the MicroTrack recording yields a completely flat wav form.  However the hash for the files (pre-inversion in the case of the jb3) are very different.  Any reason for this?

A 1 bit difference between two files could result in very different md5 hashes. 

Yeah but wouldn't that mean I couldn't have a completely flat wav form?

Is there any header info in the WAV files?

Quite possible.  How would I go about discovering if there is?

Open them in a HEX editor.
(or I think you can look at the first 16 bytes in an ASCII editor)
I believe all wav files have headers, take a look at this link:

http://ccrma.stanford.edu/courses/422/projects/WaveFormat/



A bunch more +Ts given out.  Keep the info coming.
« Last Edit: September 22, 2005, 06:25:33 PM by prof_peabody »

Offline F.O.Bean

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #249 on: September 22, 2005, 06:33:10 PM »
do you have wavelab john ???

there is a wave comparer in there, should work w/ anything up to 24/96 possibly
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Offline John Kelly

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #250 on: September 22, 2005, 06:53:47 PM »
I'm on a mac, no wavelab here.  However I'm about to post a bunch of pictures over at rig pics. ;)
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Offline John Kelly

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #252 on: September 22, 2005, 07:04:14 PM »
+T
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Offline MattinSTL

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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #253 on: September 22, 2005, 07:08:19 PM »
Thanks Kohn +T for that.

Would you consider recording some silence, then silence with mic-in, then some simple monologue or basic instrument?

So should I still be looking at a pmd671? What's your feeling so far?

Also has it always been Kohn? OR was it John K. before... am I losing my mind?
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Re: M-Audio MicroTrack 2496 - *actual* real-life experiences thread
« Reply #254 on: September 22, 2005, 07:15:47 PM »
so it still doesnt record digitally at 24 bit??
i guess its ok considering i dont have a computer that could handle those files...yet ;)
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