Operator`s manual

Manual-18
Drift compensation
Scratch LIVE works by tracking a control signal that is pressed onto vinyl records, and applying that movement to audio files. It
does this exceptionally accurately at low and high speeds, both forwards and backwards. Users have reported drifting of tracks during
long mixes, and after careful investigation we have found the lathe that mastered the original CV01 control records induced pitch
variations in the vinyl master.
Because every CV01 control record pressed had the same pitch variation, it is possible to compensate these variations in software.
To turn drift compensation on, tick drift compensation . e drift compensation is unique
for each side of the record. When you turn drift compensation on, notice the letter A in the Vir-
tual Deck, indicating drift compensation is enabled for the A side (10 minute side). To compen-
sate for drift on the B side, place the needle anywhere after the 10 minute mark on the B side. To
switch back to drift compensation for the A side, place the needle into the Vinyl Scroll area of the
A side.
is issue only affected the first batch of control records labelled CV01. If you are using con-
trol records from a later batch with Scratch LIVE version 1.2 or greater, you do not need to have
drift correction enabled. e new corrected vinyl label reads CV02, with “second edition” on the
upper right of the sleeve. You may purchase “second edition” vinyl from the Rane website if you
are in the USA. Outside of the USA, call your distributor.
If you are using the control CDs, do not use drift compensation.
Show all file types
Enable this option to show all files when importing tracks into Scratch
LIVE. If this option is not selected, only files that Scratch
LIVE can play will be displayed.
Show pitched BPM
Enable this option to show pitched BPM on the Virtual Deck. If this option is not selected, the turntable speed as a percentage
shift will be shown. e pitched BPM is calculated from the BPM in the file tag, and the turntable speed. If no BPM tag is present in
the file, the percentage pitch shift will be shown.
Rescan ID3 tags
Click this button to force Scratch
LIVE to re-read all file tags. Use this function if you have edited or modified file tags outside of
Scratch LIVE.
Tip: Rescanning the tags is a handy way to identify all the files that Scratch LIVE can’t find (for example if the files have been
altered or moved). ese tracks will show up red in the main track list, with an exclamation mark in the status column. You can sort
by the status column to group all these tracks together.
Maximum screen updates (per second)
is feature allows you to throttle back the screen refresh rate. Users with slower computers might like to do this if they are hav
-
ing performance issues. It could also be useful if you want to limit Scratch LIVE’s processor usage, for example if you are running a
recording program at the same time. e default setting is 60 Hz, or refreshed 60 times per second. is setting applies to the entire
screen (i.e. the Virtual Decks, the Waveforms, the library, and the setup screen).
Track start offset
If you find that you have cue burn at the beginning of the record, you will notice that the tracking will be poor at this point. Use
the slider to offset the start point, so that the track will start playing from a point further into the control record.
USB audio buffer size
Scratch
LIVE processes audio in small chunks. When smaller chunks are used, the movement of the record is translated into audio
more often which results in a lower overall system latency. However, this requires more processing and therefore a higher CPU load,
so lower buffer size settings require a more powerful computer to produce uninterrupted audio. If you want tighter control, you
should try decreasing this setting, on the other hand, if you experience audio dropouts, you need to increase this setting (or use a
more powerful computer).
Build overviews
If you run Scratch
LIVE with the hardware interface disconnected, you will notice a button labeled build overviews on
the main screen. Click this to automatically build the overviews for all the tracks in your library. e track name (and location) are
shown in the bar immediately below the button. Below this are three more bars. e first bar shows track reading progress, the sec-
ond bar shows overview building, and the third bar shows track writing progress. Use the the build overview function to prepare the
overviews of all your tracks before you play.