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Skratch Lessons: Several Players 5.1

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[MUSIC]
So what's up everybody, this is Alex.
Welcome.
As we all know, the world of turntable is
in constant process.
You know, everything getting bigger and
bigger due to the fact
of new playing styles or new inventions,
concerning equipment.
So and due to this fact I have invited,
today a guy who
constructed a module for, for the
synthesizer,
through which you can play a common
synthesizer by scratching the record.
This is quite fascinating, I think.
So, this guy or this guy is named Sir.
He came from Germany.
Saw him before.
We go into animated explanation of his
invention.
I will show you a little demo which we
have prepared for you.
It's something like electro style
scratching routine.
And I hope you like it.
Bye bye.
[MUSIC]
>> Synthesizers, how do they work?
This is a voltage-controlled oscillator,
also called VCO.
A VCO generates a consistent repeating
signal.
[SOUND]
This
is a voltage-control filter, or a VCF.
A VCF selects range of frequencies and
either amplifies or
reduces those frequencies.
[SOUND]
This is
a voltage controlled amplifier or a VCA.
The VCA can raise or lower the volume of
the incoming audio signal.
[SOUND]
If you intend
to play a specific note, you have to make
sure to control the pitch of the VCO.
Controlling the pitch of the VCO, can be
accomplished by a controlled voltage,
respectively CV.
[SOUND]
In
general the CV comes from a keyboard or a
MIDI to CV device.
Additionally, when pressing down a key on
a key board,
an on gate signal is generated and by
releasing the key, an off signal is sent.
Raising or lowering the volume.
That is to open or close.
The gate signal, is sent directly to the
VCA.
[SOUND]
To make the sound more lively, all you
have to do is to control the VCF and the
VCA parameters, over some period of time.
To do so, use an ADSR envelope generator.
That manipulates the parameters of the VCF
and VCA.
By applying a gate signal to the ADSR
generator,
it sends out a new signal controlling the
VCF and VCA.
[SOUND]
So
how do you combine a turntable with a
synthesizer?
You simply replace the VCO with your DJ
set up.
All you need, is a record or an MP3 with a
consistent repeating tone.
The signal pitch can be operated in three
ways.
First, it can be changed by hand.
[SOUND]
Second, by operating the turntable pitch.
[SOUND]
And
third, you can change it by using a DVS, a
MIDI controller,
as well as an MP3 consisting of musical
scale, with cue points set on each note.
[SOUND]
An envelope
follower generates the gate signal,
meaning if the envelope follower receives
an audio signal from the DJ setup, it
sends out an on gate signal.
And if the cross fader is being closed, it
sends out an off gate signal.
[SOUND]
This kind of synth patch, varies
the incoming signal from your DJ setup, in
the same way as a guitar synthesizer does.
[MUSIC]