Attack
Waldorf
33
Operation Manual
synthesizer systems. A keyboard generates an active gate signal as long as a key is held
down. When the key is released, the gate signal becomes inactive again. An envelope
generator can use this signal for triggering purposes, and as a result a VCA unit can be
controlled.
High Pass Filter
A high pass filter dampens all frequencies below its cutoff frequency. Frequencies abo-
ve the cutoff point are not affected.
LFO
LFO is an acronym for low-frequency oscillator. The LFO generates a periodic oscillati-
on at a low frequency and features variable waveshapes. Similar to an envelope, an
LFO can be used to modulate a sound-shaping component.
Low Pass Filter
Synthesizers are often equipped with a low pass filter. It dampens all frequencies above
its cutoff frequency. Frequencies below the cutoff point are not affected.
MIDI
The acronym MIDI stands for "musical instrument digital interface." It was developed in
the early '80s so that diverse types of electronic musical instruments by different ma-
nufacturers could interact. At the time a communications standard for heterogeneous
devices did not exist, so MIDI was a significant advance. It made it possible to link all
devices with one another through simple, uniform connections. Essentially, this is how
MIDI works: One sender is connected to one or several receivers. For instance, if you
want to use a computer to play the Pulse, then the computer is the sender and the Pulse
acts as the receiver. With a few exceptions, the majority of MIDI devices are equipped
with two or three ports for this purpose: MIDI In, MIDI Out and in some cases MIDI
Thru. The sender transfers data to the receiver via the MIDI Out jack. Data are sent via
a cable to the receiver's MIDI In jack. MIDI Thru has a special function. It allows the
sender to transmit to several receivers. It routes the incoming signal to the next device
without modifying it. Another device is simply connected to this jack, thus creating a
chain through which the sender can address a number of receivers. Of course it is desi-
rable for the sender to be able to address each device individually. Consequently, there
is a rule which is applied to ensure each device responds accordingly.
MIDI Channel
This is a very important element of most messages. A receiver can only respond to in-
coming messages if its receive channel is set to the same channel as the one the sender
is using to transmit data. Subsequently, the sender can address specific receivers indivi-
dually. MIDI Channels 1 through 16 are available for this purpose.
MIDI Clock
The MIDI Clock message determines the tempo of a piece of music. It serves to syn-
chronize processes based on time.
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