2.1
Connection required - MIDI or CV/Gate?
You can elicit a sound from the DELTA CEP A without connecting a keyboard, sequencer,
calculator or anything else. Simply press the [GATE]-button in the ADSR Envelope section.
But that's not fun. There are generally two ways to provide the DELTA CEP A with external
information that causes it to produce sounds and effects - the MIDI interface and a CV
voltage paired with so-called gate or trigger signals.
2.1.1 MIDI - Music Instrument Digital Interface
The DELTA CEP A has a MIDI input on the front panel. If you just want to play it over a MIDI
keyboard, connect the MIDI output of the keyboard to the MIDI input of the DELTA CEP A
and play it on the keys of the keyboard. If you see the GATE LED light up while playing,
you've done everything right. If the keyboard is set to a different MIDI channel, hold down
the DELTA CEP A [LEARN] key and press a note. Now the control should work.
Of course, if you have the desktop version of the DELTA CEP A, you can use the MIDI input
on the back of the device. Not only does this provide cosmetic benefits - the MIDI data is
routed to the MIDI THRU output when using the rear MIDI input.
2.1.2 CV/GATE
CV is an abbreviation for Control Voltage. For Eurorack modules, the following voltages
were set as standard:
A keyboard with a CV output that complies with the 1V / Octave standard can be plugged
into the 1V / Oct input of the oscillator section. On the very popular Arturia Keyboard
'KEYSTEP' this output is labeled 'Pitch'.
In contrast to the CV voltages listed above, the gate signal is usually a so-called ramp
voltage with a fixed voltage value. Without gate signal we measure 0 Volt and with gate
signal a certain, not changing voltage. The Eurorack system has a gate voltage of + 5V. To
increase compatibility and reduce the susceptibility to errors, most GATE-controlled inputs
can handle significantly lower or higher voltages. The DELTA CEP A will process gate
signals between 2 and 10 volts without any problems. Thus, the envelope can also be
triggered by a rectangular LFO, which can only output a maximum of +2.5 volts.
A CV / GATE keyboard will normally output the gate signal as long as you hold down the
key. Pressing the button thus triggers the gate voltage and releasing the button switches
the gate voltage back to 0 Volt. The pitch CV voltage, on the other hand, is usually
outputted until another key with a correspondingly different CV voltage is pressed. This is
important so that the pitch does not drop when you release the key. Sounds often have a
certain release time, during which the pitch should of course remain stable. Use caution
Control- and Signalvoltages in the world of Eurorack.
Pitch Control
The standard is set to 1 volt per octave. In other words, when the
voltage is increased by one volt, the pitch of an oscillator doubles -
which is one octave.
LFO Output range
The LFO modulation voltages typically range between -2.5 and +2.5
volts (5VPP).
ADSR output range
Usually between 0 and 8 volts.
Audio Signals
Audio signals, which can also be used for modulation, usually have a
voltage swing of 10 Vpp (between -5 and +5 volts)
von
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Summary of Contents for DELTA CEP A
Page 1: ...Owner s Manual DELTA CEP A...
