Ableton Live Intro Manuel d'instructions télécharger pdf (Page 368)

CHAPTER 30. AUDIO FACT SHEET 366

30.2.4 Summing at Single Mix Points

Since version 7, Live uses double precision (64-bit) summing at all points where signals are

mixed, including Clip and return track inputs, the Master track and Racks. Mixing in Live is

thus a neutral operation for signals mixed at any single summing point. This is tested by

loading pairs of 24-bit les (white noise and xed-frequency sine waves and their phase-

inverted complements), adding the pairs together eight times and rendering the output as

32-bit les. All tests result in perfect phase cancellation.

Please note that, while 64-bit summing is applied to each single mix point, Live's internal

processing is still done at 32-bit. Thus, signals that are mixed across multiple summing

points may still result in an extremely small amount of signal degradation. This combination

of 64-bit summing within a 32-bit architecture strikes an ideal balance between audio quality

and CPU/memory consumption.

30.2.5 Recording external signals (bit depth >/= A/D converter)

Recording audio signals into Live is a neutral operation, provided that the bit depth set in

Live's Preferences window is the same or higher than that of the A/D converters used for

the recording. In this context, neutral means identical to the audio as it was delivered to

Live by the A/D converters.

30.2.6 Recording internal sources at 32 bit

Audio that is recorded via internal routing will be identical to the source audio, provided

that the recording was made at 32 bits. To ensure neutral recordings of plug-in instruments

and any audio signals that are being processed by effects plug-ins, internal recording at 32

bits is recommended. Please note, however, that if the source audio is already at a lower

bit depth, internal recording at that bit depth will also be neutral (assuming that no effects

are used); internally recording an unprocessed 16 bit audio le at 32 bits will not increase

the sound quality.

The neutrality of internal recording is veried using cancellation tests.

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Ableton Live Intro Manuel d'instructions Page 368