Manual

102 PRO X User Manual
Also included are three frequency weighting curves, which can be selected using
the Weight parameter. Weighting curves are a set of factors that are used to
weigh measured values to a certain frequency response. The main reason for this
is to allow for the response of human hearing. Recent research into the response
of the human ear has revealed a atter response in the higher frequencies at high
sound pressure levels. Therefore this parameter can be switched between Flat,
the traditional weighting A, and the more recently developed weighting C.
The Compare mode allows the user to select any two signals and display a
comparison of the frequency spectrum across the two graphs. Essentially the two
displays become one, with the top display showing positive dierences between
the comparison signals, and the lower display inverted to show negative
dierences. The scale on the display will also change to compensate.
Tape Saturation
As its name suggests, the Tape Saturation eect emulates analogue tape
saturation; when the amount of magnetised particles required to fully record and
reproduce an audio signal exceeds the amount available. This can be heard as
analogue ‘warmth’, and similar eects can be achieved in the digital domain by
emulating various analogue tape artefacts.
An example of this is tape’s tendency to compress the high frequencies in
‘transients’, or peaks in the audio signal, and while this is a side-eect of using
analogue tape, it can also be desirable when trying to achieve a vintage tape
sound. This eect can be altered by use of the Transient Smoothing control.
Another way to achieve that nostalgic tape sound is by the creative use of biasing;
most professional tape machines are set up to compensate for this, in other
words, to be slightly overbiased. The Overbias control is used to emulate this by
reducing the amount of tape distortion at the expense of the high frequencies
and transients. The limit of the high frequency response is also controlled by the
overall frequency response of the tape process, and this in turn is aected mainly
by utilising dierent tape speeds. Slower tape speeds (3.1 / 4 / 7.5 ips) have less
high frequency denition and a boost at low and mid frequencies, whereas
higher speeds (15 / 30 ips) have better high frequency representation and less
extreme lower ends resulting in more accurate audio reproduction.
Yet another important element to tape emulation is the output transformer
which supplies a low end ‘bump’ in the frequency response and increases
harmonic distortion of frequencies between approximately 50 – 100 Hz.
The amount of distortion can be controlled by eective use of the Transformer
Drive control.
Variable Phase
The Variable Phase eect allows the user to alter the phase of a signal by a
variable amount. The unit has eight variable phase inputs, each with a mono
signal with its own set of parameters, and the ability to stereo link between
each pair.
The eect works using two all-pass lters in series, and controlling the centre
frequency of the lters to change the phase shift. The all-pass structure allows for a
at magnitude-frequency response, however the lters delay dierent frequencies
by dierent amounts resulting in a frequency-dependent phase shift.
Additional features have been added to this fundamental design by allowing
control over the frequency range of the centre frequencies. The Phase Frequency
Range allows a greater range of frequencies to be covered by the control. The user
can also switch between a 90º or 180º phase shift by using the 180º / 90º Phase
Shift button.
Dual Stereo Delay
The dual stereo delay eect is a simpler, more concise, version of the current
delay device with the advantage of having two units in one eect device rack
space. The dual stereo delay is a dual stereo in and dual stereo out device with
metering for each discrete input and output.
BPM display mode:
• Tempo is accurate to 0.1 bpm.
• With global tap enabled the display shows global tempo regardless of
delay time setting.
• With global tap disabled the display shows the equivalent tempo
assuming a delay of one beat. For example, if the delay time is 500ms the
tempo is calculated as 60/0.5 = 120 bpm.
• Up/down buttons adjust local or global tap tempo by 0.1 bpm.
Millisecond display mode:
• With global tap enabled the display shows current delay (in milliseconds)
based on global tempo and selected musical interval. For example, if a 1/8
dot interval is selected on the delay control and the global tempo is 120
bpm the delay value shown will be 0.75 x 60/120 bpm = 375 ms.
• With global tap disabled the display shows the actual delay time set on
the unit.
• Up/down buttons adjust delay units by 1 millisecond increments.
If the global tap option is enabled the delay time rotaries will change from
seconds (milliseconds) to musical note durations as they do with the current
eects units. However, the seven-segment LED display will continue to follow the
display mode selected. Also, if the global tap option is enabled the tap button on
the unit will not aect the global tempo and should be greyed out.