Antares Infinity user manual

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Crossfade Taper: This control adjusts the taper shape of the crossfade that
is used in the attack/loop merge. It is adjustable from 0 (linear taper) to 100
(equal power taper). It should be adjusted to provide the smoothest
transition between the attack and loop segments of the sample.
100 
EQUAL POWER TAPER
0 
LINEAR TAPER
Linear taper should be used for editing simple periodic waveforms like solo
instruments. Equal power taper should be used when editing complex non-
periodic waveforms like string...

52
HOW IT WORKS
The SPR Looper is similar to the Rotated Sums Looper in that it rotates loop
data a random amount through the loop. The difference with the SPR
Looper is that it treats every constituent frequency of the loop separately.
This approach is more thorough than the Rotated Sums Looper. Because the
SPR Looper rotates each spectral component randomly, different trials using
the same input sound will yield different results.
If the computations cause the loop data to exceed 90% of maximum, the...

53
Pre-condition Data (%): The Freeze Looper and the SPR Looper both use the
Pre-condition Data feature before processing the loop data. The purpose of
this feature is to taper the data at the loop start and loop end so that all
the energy components in the loop begin and end on zero. The control has
a range from 0% to 100%. Any setting larger than a few percent leaves
little or no energy at the loop points to cause a click which might inject
unwanted noise into the process.
Increasing the...

54
Loop Start Test Points: This controls the number of points that are tested
during the search phase of the merging process. It works as in the Rotated
Sums Looper.
Crossfade Length: This control sets the amount of the loop that is blended
with the attack segment. It is variable from 0% to 100% of the attack
duration. A large crossfade length will cause the attack to slowly blend into
the loop sound. A smaller crossfade length will create a quick but blended
transition between the two segments of the...

55
THE SYNTHESIS LOOPER
The Synthesis Looper tool can be used to selectively smooth out lumpy
sounding frequencies in chorused and ensemble sounds. The new sound is
more stable and loop repetitions are less noticeable. This control is
achieved by allowing you to specify the sidelobe widths of the harmonic
series as a function of frequency. You can control the sidelobe widths to
continuously range from the wide sidelobes of the original ensemble sound
to the zero width sidelobes of the Freeze Looper.
This...

56
SOME THEORY
Temporal variation occurs when two sinusoidal frequencies are not exactly
in tune. For example, if one sine wave generator is tuned to 1000 Hz (Hertz
or cycles per second) and another is tuned to 1001 Hz, a 1 Hz “beat note”
will be produced. A temporal variation will also occur when there is any
integer relation between the frequencies involved: if one sine wave
generator is tuned to 500 Hz and another is tuned to 1001 Hz, a 1 Hz beat
note will also be produced.
Many solo instruments (sans...

57
Rule 01: An ensemble composed of instruments playing the same note
or notes in octaves will form an energy distribution as a function of
frequency having energy at the fundamental frequency and integer
multiples of the fundamental frequency.
Rule 02: The energy distribution at the fundamental frequency will
form a Normal PDF whose sidelobe width depends on the intonation
quality of the players: in-tune players will generate a narrower
sidelobes than players who are more out of tune.
Rule 03: Each...

58
If the computations cause the loop data to exceed 90% of maximum, the
entire file will be scaled so that the loop data are 90% of maximum and
thereby do not clip. Thus, data are scaled so no overflow occurs. When
scaling occurs, the user is notified with an alert which indicates how much
the data was scaled. The scaling information will allow you to maintain
volume control of your samples. If you are getting clipping in the fade from
the attack segment, check out that the crossfade taper may be set...

59
With both phases of the process enabled, the loop data and the attack data
are altered every time the Synthesis Looper process is run. It is sometimes
desirable to disable the attack/loop merge phase of the process, and do
several takes of processing the loop data without merging the loop with
the attack. This saves time and allows for selecting the best sounding loop
before the attack segment is altered by merging. After the best sounding
loop is found, the merge can be done separately by disabling...

60
When Merge the Attack and Loop Segments is checked in the dialog,
Infinity will automatically search a number of points in the loop segment to
find the point which most closely correlates to the end of the attack
segment. The number of test points that are tried during the search can be
controlled using the Loop Start Test Points control. Processing time in-
creases as more points are tried.
When the best merge point is found, Infinity rotates the data in the loop
until the merge point is located at...