Like already said, change 'resample' to 'pro transient' in the channel settings.
there are several algorhythms available, you can use any other than resample... im not saying dont experiment with pro transient, but there are algorhythms for vocals so they would obviously be a good starting point. like the name suggests, pro transient will stretch the sample and try to keep the transients in tact, particularly important if stretching drums or percussion... not so important with vocals
theres a piece in the manual describing the timestretch function and each algo....
Stretch Method (drop-down menu) - Selects a sample Time Stretch/Pitch Shift method. Please note that the Sampler Channel implements a simplified version of the 'ZPlane Elastique Pro' algorithms used by the Time Stretch/Pitch Shift Tool. We recommend using Edison if you require maximum control over the Time Stretch/Pitch Shift process. Options in the Sampler Channel include:
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Resample - Standard pitch shifting that varies sample length to change pitch.
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Pro default - The 'Default' mode is designed to work with a wide range of input signals, try the other modes only if 'Default' fails to give the result you need.
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Pro transient - For certain sounds, transients are crucial to the overall result (percussion, for example). This mode attempts to preserve the transients in the input signal.
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Transient - A lower CPU usage transient-preserving stretch method which corresponds to the Elastique time-stretching default mode. It is provided as an alternative to the 'Pro Transient' mode.
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Tonal - Provides higher quality for input signals with a focus on tonal (pitched) elements.
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Monophonic - Specialized for monophonic input signals (such as vocals or solo instruments) and should give the best results for these type of signals. The tonal quality is achieved through formant preservation.
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Speech - Optimized for speech. (For singing, use the 'Monophonic' mode).
