Antares Infinity user manual

41
LOOP POINTS IN OTHER FILE FORMATS
Two loop points exist in the AIFF and the Sound Designer I formats, the
sustain loop and the release loop. Currently, Infinity only deals with the
sustain loop.
In Sound Designer II, the sustain loop is called Loop 1 and the release loop
is called Loop 2. Infinity will read only Loop 1 from a Sound Designer file as
the sustain loop. When Infinity writes to a Sound Designer II file, all other
loops are lost.
THE CROSSFADE LOOPER
The standard crossfade loop is created...

42
ABOUT SMART AUTO-SCAN
This algorithm searches the soundfile for places where the sound at one
loop point matches the sound at the other loop point. The closeness of the
match and the number of places in the soundfile that are searched are
controllable using the Auto-Scan Settings dialog shown below.
Conventional “auto” functions move the loop points to the nearest zero
crossing or the nearest zero crossing with the same slope. Smart Auto-Scan
compares the amplitude and the phase of the major harmonics...

43
Infinity will continue to search until it finds a matching value which is
greater than or equal to the value of the Matching Threshold set in the
Auto-Scan Settings dialog. If none is found, an audio signal will sound,
indicating the end of the search. The loop points will remain in their
original locations. Pressing  or  will terminate the
search.
Clicking on a single arrow will move the loop point one pixel in the direc-
tion of the arrow. Pressing on a single arrow will cause the loop point to
move...

44
Crossfade Taper: This control adjusts the taper shape of the crossfade that
is used to blend the attack and loop segments. 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. Use equal power taper for string sounds, choruses, and other non-
periodic sounds. Linear taper is best used with periodic waveforms like solo
instruments.
100 
EQUAL POWER TAPER
0 
LINEAR TAPER
Linear...

45
HOW IT WORKS
The Freeze Looper quantizes all the sound energy in the loop to a precise
harmonic series, giving a waveform that is perfectly repeated in every cycle.
The Freeze Looper outputs a constant pitch equal to the average pitch of
the original loop segment.
The Freeze Looper uses the MIDI Note Number to set internal processing
parameters. Because these settings effect the results, the MIDI Note
Number should be set to the approximate pitch of the sound being looped.
The size of the loop segment...

46
UNDERSTANDING THE DIALOG CONTROLS
Soundfile Menu: The Soundfile Menu shows the name of the last active
soundfile. All open soundfiles are listed in the menu. The Freeze Looper
operates on the soundfile which is displayed in the menu.
Pitch Control Radio: Previously, Freeze Looper had Pitch Detection built-in.
This means the harmonic series energy distribution and output tuning was
determined by an algorithm that detected the exact pitch of the original
loop. The MIDI note was used as an initial guide...

47
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 sample. A setting of zero
creates no crossfade.
AT TACK
SEGMENTLOOP
SEGMENT
50%
Crossfade Taper: This control adjusts the taper shape of the crossfade that
is used...

48
THE ROTATED SUMS LOOPER
The Rotated Sums Looper creates seamless loops by randomly distributing
sonic irregularities throughout the loop. It is very effective with sounds that
have non-periodic waveforms like chorus, string orchestra, complex synth
patches, sounds that include noise, and so on.
NOTE: Sounds must be pre-looped before using the Rotated Sums
Looper. Any clicks, pops or other irregularities will be distributed
throughout the loop and show up as noise. Use the Crossfade Looper
to smooth...

49
HOW IT WORKS
In a crossfade loop, all of the different frequencies in the sound make a
transition from one phase to another during the crossfade. This causes
different combinations of constructive and destructive interference at the
location of the crossfade. Because this happens for all frequencies at the
same point in the loop, a noticeable “bump” is produced by the crossfade
looping process.
The Rotated Sums Looper creates a seamless loop by adding together many
random rotations of the input loop,...

50
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...