Final Scratch is a DJ tool created by the Dutch company N2IT with input from Richie Hawtin (aka Plastikman) and John Acquaviva that allows manipulation and playback of digital audio sources using traditional vinyl and turntables. It seeks to cross the divide between the versatility of digital audio and the tactile control of vinyl turntablism. DJ or dj may stand for Disc jockey, dinner jacket The DeadJournal website, or Djibouti. ... Richie Hawtin (born Richard Hawtin, June 4, 1970, Banbury, Oxfordshire, England) is a Canadian electronic musician and internationally-touring DJ who was an influential part of Detroit technos second wave of artists in the early 1990s. ... Digital audio comprises audio signals stored in a digital format. ... DJ Mixer. ...

Concept

Special vinyl records pressed with a digital timecode are played on normal turntables. The timecode signal is interpreted by a computer, connected to the turntables through an interface called the ScratchAmp. The signal represents where the stylus is on the record, in which direction it is traveling, and at what speed. This information is interpreted by the computer and used to play back a digital audio file which has been 'mapped' to the turntable.

In practical terms, this means that any audio file can be manipulated as though it were pressed on vinyl. This has a great many advantages for DJs, not least that a laptop computer can often hold tens of thousands of audio files, whilst a record box has a decidedly smaller capacity and is much heavier.

Advantages/Disadvantages

This system has various advantages over using normal records, without too many serious disadvantages. Record is also a music album by Montreal-based band Sofa. ...

Advantages:

• Portability of thousands of audio tracks, (laptop or external HDD as opposed to record box) with quick access and organization
• Ability to play audio tracks unavailable on vinyl eg. pre-arranged loops, unreleased music or rare tracks
• The use of CD deck features (software permitting) such as keylock, pitch shift, looping, instant cue locating and visual indicators of audio features such as loud or quiet parts
• The ability to prevent needle skips on the vinyl being reflected in the playback of the audio track being played/controlled (software permitting)
• Digital audio files will not degrade every time they are played, plus they can easily be backed up so if anyone should steal or accidentally damage your music collection, you may only have to replace easily obtainable hardware such as a laptop or hard drive instead of irreplaceable vinyl
  

Disadvantages: For the band, see Laptop (band). ... Typical hard drives of the mid-1990s. ... // A loop is generally something that closes back on itself such as a circle or ring. ... CD may stand for: Compact Disc Canadian Forces Decoration Cash Dispenser (at least used in Japan) CD LPMud Driver Centrum-Demokraterne (Centre Democrats of Denmark) Certificate of Deposit České Dráhy (Czech Railways) Chad (NATO country code) Chalmers Datorförening (computer club of the Chalmers University of Technology) a 1960s... Pitch shift is a sound recording technique, in which the normal pitch or tone of a sound is altered (shifted), for effect or for other purposes. ... // A loop is generally something that closes back on itself such as a circle or ring. ... Cue may refer to one of the following. ... Digital audio comprises audio signals stored in a digital format. ... For the band, see Laptop (band). ... Typical hard drives of the mid-1990s. ...

• Reliability; depending on the hardware/software configuration used, vinyl emulation systems may use more system resources than some laptops or PCs offer, making them unsuitable for this use.
• Timecoded vinyl is generally much more expensive than a typical music record and will suffer much more damage than one too, meaning less longevity.
• Ease with which the system can be damaged. The smallest amount of liquid spilt by an unassuming by-stander could permanently damage a laptop or short out other electrical connections

A stylised illustration of a modern personal computer A personal computer (PC) is a computer whose original sales price, size, and capabilities make it useful for individuals. ... For the band, see Laptop (band). ...

History

Final Scratch has passed through multiple stages of development. These stages are marked by involvement with different vendors, hardware configurations, software developers and operating systems.

Pre-release

Final Scratch was originally developed for BeOS, and premiered at the Be Developer Conference in 1998. BeOS is an operating system for personal computers which began development by Be Inc. ...

Versions 1.0-1.5

All versions of Final Scratch 1 use the same Scratchamp, a USB and RCA device in a round plastic shell. The technical specifications of this device have been closely guarded by Stanton as an anti-piracy measure, though some users, unsatisfied with the latency and instability of the system, have alleged the use of faulty Philips sound chips which had already been withdrawn from the market. However, the same chipset was being used in several other USB audio devices manufactured by companies like Griffin and Roland at that time. USB redirects here. ... A panel of four RCA jacks, and three RCA (cinch; phono) plugs of various quality RCA jack in PlayStation 2 An RCA jack, also referred to as a phono connector or CINCH/AV connector, is a type of electrical connector which is commonly used in the audio/video market. ...

FS 1.0 was released for PC only, on a specially modified distribution of Debian Linux. It was relatively primitive but some users found that, if configured correctly, it outperformed all subsequent versions of Final Scratch 1.x. Debian is a free operating system. ... This article is about operating systems that use the Linux kernel. ...

With version 1.1, Stanton Magnetics began working with Native Instruments on the software side of the product, which became Traktor Final Scratch. As the name suggests, this bore a resemblance to the interface of Traktor, a Native Instruments software DJing product. This version was once again available on Linux, but was also ported to Mac OS X. Stanton Magnetics, founded in 1946, is a manufacturer of professional audio equipment for DJs. ... It has been suggested that Traktor DJ Studio be merged into this article or section. ... Mac OS X (pronounced ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ...

The next major revision was version 1.5, which added a Windows XP version, but dropped Linux support. This version also added the ability to keep the pitch of the record constant whilst shifting the tempo. The interface changed very little, but some users initially had issues with the Windows Scratchamp drivers. Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ... This article is about operating systems that use the Linux kernel. ... Pitch may refer to: Look up Pitch in Wiktionary, the free dictionary. ... For other uses, see Tempo (disambiguation). ...

Version 2

Version 2 marks the introduction of both a new Scratchamp hardware device and different software compatibility.

This new Scratchamp made 24-bit/96 kHz digital quality playback and record possible. Stanton added an ASIO driver, and MIDI capabilities. They also replaced the USB interface with Firewire which was intended to reduce playback latency. The new Scratchamp was developed by Alan Flum, Len Bryan, Mark DeMouy and Jim Mazur. ASIO (Audio Stream Input Output) is a protocol for low-latency digital audio specified by Steinberg. ... Musical Instrument Digital Interface, or MIDI, is a system designed to transmit information between electronic musical instruments. ... USB redirects here. ... The 6-pin and 4-pin FireWire 400 Connectors The alternative ethernet-style cabling used by 1394c FireWire is Apple Inc. ...

The version 2 Scratchamp is compatible with Native Instruments Traktor DJ Studio versions 2.6 and through 3.2.0.80. NI has dropped support of SA2 in favor of their own vinyl system Traktor Scratch. It has been suggested that Traktor DJ Studio be merged into this article or section. ... Traktor DJ Studio is the most used DJ-Software in the world. ... Traktor Scratch is a computer hardware and software package for hands-on control of digital audio playback. ...

Final Scratch Open

In late 2005, Stanton and Native Instruments ended their working relationship. Stanton still markets the ScratchAmp hardware as part of Final Scratch Open, introduced in early 2007. Stanton claims that the ScratchAmp can now interact with any audio software through ASIO or WDM on Windows, and CoreAudio in Mac OS X. Although all Windows and Mac audio software is ostensibly compatible with Final Scratch Open, there is no dedicated software program for deejaying with the ScratchAmp hardware. ASIO (Audio Stream Input Output) is a protocol for low-latency digital audio specified by Steinberg. ... In computing, the Windows Driver Model (WDM) — also known (somewhat misleadingly) at one point as the Win32 Driver Model — is a framework for device drivers that was introduced with Windows 98 and Windows 2000 to replace VxD, which was used on older versions of Windows such as Windows 95 and... 1. ... CoreAudio is a fairly low-level API for dealing with sound in Apples Mac OS X operating system. ... Mac OS X (pronounced ) is a line of graphical operating systems developed, marketed, and sold by Apple Inc. ...

Internal workings

The internal workings of Final Scratch are quite simple to understand. Multiple open source software libraries have been created to decode the Final Scratch time code. The information here comes from those libraries.

A basic Final Scratch setup consists of five pieces of equipment.

1. A computer running a compatible software, usually Native Instrument's Traktor
2. The ScratchAmp
3. Two turntables or two CD decks made for DJ'ing
4. Two time coded vinyl records or time coded CD's
5. An audio DJ mixer.

ScratchAmp

The ScratchAmp is a firewire (FS 2, FS Open) or USB (FS 1) audio device. It has two phono/line stereo level inputs to read the timecode from the record or the CD, and two line level stereo outputs to feed into the audio DJ mixer line channels. It also has two phono stereo outputs for pass-through of the actual phono audio signal. This is useful for DJs who wish to play both digital audio tracks AND traditional vinyl; allowing them to switch between the two sources without disconnecting or re-connecting audio jacks in the middle of a DJ set. The 6-pin and 4-pin FireWire 400 Connectors The alternative ethernet-style cabling used by 1394c FireWire is Apple Inc. ... Note: USB may also mean upper sideband in radio. ...

The ScratchAmp does not store any audio on its own, It is simply a purpose built external Soundcard. It communicates with a PC—usually a laptop—over the firewire or USB connection. The laptop uses Final Scratch compatible software (typically Traktor DJ Studio) to interpret the timecode signal from the supplied special vinyl/CD, then play back a digital audio file based on that signal, allowing traditional DJ vinyl control of MP3, WAV and Apple AAC audio files. The Laptop software then sends audio data back, over the same firewire/USB connection to the scratch amp, which then sends an audio signal out through the line level output, for playing through a DJ Mixer or Amp.

Audio/Data Routing

A step by step series of events detailing how Final Scratch operates;

1. Timecoded audio signal pressed onto vinyl/CD picked up by vinyl/CD turntable
2. Signal routed into SratchAmp via phono connection, then into PC/Mac via USB or Firewire
3. DJ software decodes timecode signal and determines position, speed and direction the Vinyl/CD is being played or manipulated
4. DJ software plays the selected "mapped" digital audio file synchronous to the vinyl/CD playback
5. Digital audio file audio signal is sent to the Scratchamp phono connectors for connection to a DJ mixer or Amp

Vinyl/CD time code

The most complex piece of the Final Scratch setup is the code pressed onto the vinyl. A 1200 Hertz amplitude modulated sine wave is pressed into the left and right channels with a phase difference of 90 degrees. Each channel holds one of the two bit streams required for the time code. In one cycle of either wave form, two bits are stored: one on the positive voltage peak and one on the negative voltage valley. The relative amplitudes of these peaks represent either a binary one or zero. A relatively high amplitude on either peak represents a one, a relatively low amplitude represents a zero. In each channel is a separate bitstream, the left channel is not identical to the right (disregarding the phase difference).

Finding position

The time codes themselves consist of 40 individual bits, or 20 cycles on each channel's waveform. On the right channel the bit sequence of 0, 0, 0, 1 represents the start sequence for a single time code. Those four bits along with the four corresponding bits on the left channel and the next 16 bits on each channel can be decoded as an integer position value which represents where the needle is on the record.

Finding speed

The speed at which the record is spinning can be found by comparing the frequency of the waveform being read from the record to the true frequency of the wave form on the record at normal speed. This difference represents the change from the normal speed at which the record turns.

Finding direction

The direction which the record is spinning at any given time can be found using the phase difference between the waves on the two channels. This procedure is the same as that used to determine the direction in which a ball mouse is moving.

Issues regarding time code errors

Because a single time code is made up of 40 consecutive bits, read errors can cause a timecode to be unreadable even if a single bit is misread. A bit that has become unreadable due to a scratch can make an entire 40 bit long time code permanently unreadable. Dust can have a similar effect on the time code. The time code implements very little error checking, an attribute strong in a number of other vinyl control systems.

See also

• Vinyl Emulation Software

This does not cite any references or sources. ...

Other vinyl emulation systems

• Serato Scratch Live
• PCDJ Scratch
• Ms Pinky
• D-Vinyl 20-20
• Traktor Scratch
• xwax
• Deckadance
• Quad

A DJ technology produced by Rane that allows the user to play mp3s from his or her computer using vinyl or CDs as a controller. ... Traktor Scratch is a computer hardware and software package for hands-on control of digital audio playback. ... Xwax is open source vinyl emulation software that is designed to run in Linux and possibly other operating systems where such software is not normally available. ... Deckadance is a DJ console and mixing tool developed by Image-Line software. ... Look up quad, quadri- in Wiktionary, the free dictionary. ...

Wu Electronics story

In 2007, Wu Tang Clan member and producer RZA claimed that he developed a superior and precedent version the same technology in 1997, which he named The Replicator. He claims that he was unsuccessful in filing a patent suit against the Final Scratch developers for stealing his concept [1]. This story remains unsubstantiated, but has sparked some speculative discussion on relevant blogs[2][3][4], and in the talk section of this article. The Wu-Tang Clan is a pioneering hardcore rap group, originally from Staten Island, New York, USA (Staten Island is referred to as Shaolin in their lyrics). ... RZA (IPA pronunciation: ; born , July 5, 1969) is an American hip hop producer, rapper and actor. ...

External links

• Native Instruments website
• Stanton Website
• John Acquavia on Final Scratch / RBMA video lecture session

Sources

Werde, Bill (October 25, 2001), "The D.J.'s New Mix: Digital Files and a Turntable", New York Times, <http://query.nytimes.com/gst/fullpage.html?res=9B04E1DA1531F936A15753C1A9679C8B63>. Retrieved on 20 August 2007