Arturia Mellotron V, Руководство пользователя

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7.2.8. Tune
Another useful parameter. It allows to fine tune a sample. Tuning may be raised or lowered
up to 100 cents (one semitone).
7.2.9. Stretch
This is a very important parameter, and another one that only works with user samples.
The original Mellotron played one tape for each note. This means that no sound was ever
transposed. The included original tape sounds preserve this behavior (each note is recorded
separately).
However the same doesn't happen when we use our own samples. Samplers usually repitch
the original samples by reading them at different speeds. The faster they read them, the
higher the pitch will be. The slower they read them the lower the pitch will be.
This presents some problems, like changes in the inner rhythms and pulses of the sounds,
transposing formant regions (which alter significantly the spectrum of the sound), etc. It
also alters the duration of the sound. When the sound is read faster, it lasts shorter. When
the sound is read slower it lasts longer.
Mellotron V can play samples this way too, but the default way is through a high-quality
" stretch" algorithm. This algorithm plays the samples in a way so that, although they are
repitched according to the played note, the duration is not affected. So, the inner rhythms
are preserved. If we would play a rhythmic sequence in the original Mellotron, we could
play a note in the lower end of the range and another four octaves above, in the higher end,
and the two would remain perfectly in sync.
That's what Stretch does. It allows to use your own samples as if they were tape frames
from the original Mellotron.
Default for Stretch is On, but it can be turned Off, in which case the Mellotron V sample
playback will behave like any regular sampler (slowing down in lower regions and speeding
up in higher regions).

♪ : Beware that the Stretch function is CPU intensive. If you experience too much CPU taxing or CPU
overload when using your own samples with Stretch On, try turning it Off.
7.2.10. Start (Sample Playback Start Point)
Works the same way as the Sample Start Handler [p.49] . Any editing performed in this field
will be reflected by that handler.
7.2.11. End (Sample Playback End Point)
Works the same way as the Sample End Handler [p.49] . Any editing performed in this field
will be reflected by that handler.
51 Arturia - User Manual Mellotron V - TAPES AND SAMPLES MANAGEMENT