Sampler anti-aliasing and pitch-shifting comparison

When samples are pitched up or down, Samplers create various artefacts.

Testing method
At 120 BPM:
8 tones up (C4-C5), 8 tones down (C4-C3)

Realtime winners
Kontakt 3, VSampler 3.1 and Emulator X

Offline winners
VSampler 3.1, Emulator X, Modplug, Fruityloops, Renoise, Madtracker

Info
What is aliasing?
Jeskola Comparison

Soft/Hardware Sampler	Listen	Full spectral view taken with Cool Edit
Buzz Matilde Tracker: Linear and Spline Interpolation	WAV	Aliasing errors when pitched up (lower left corner: the bigger red points), and unwanted resampling artefacts when pitched down (upper right corner)
Native Instruments Kontakt 3 3 resampling modes to choose: Standard, High and Perfect	WAV	This is -Perfect-. You rock Wolfgang Schneider!
Native Instruments Kontakt 1.3	WAV	It's okay.
Propellerheads Reason 3-4 NN-XT Digital Sampler	WAV	With "High Quality Interpolation" on, it sounds fine.
Emulator X	WAV	With "Ultra-High Precision Interpolation" on, it's the bomb! Jaime from EMU comments: "We spent lots of time engineering our interpolation such that it is the best balance between anti-aliasing and keeping the harmonic content of the sound in tact. Other interpolators do well anti-aliasing but sound dull."
Emagic EXS24 MKII	WAV	Ouch, quite bad. What about a high quality switch?
Gigasampler 2.54 Thanks to Anonymous from Hungary for sending the file.	WAV	Wow. Never thought that an ugly interface could sound that good!
Fruityloops Studio 4 Rendered output: with method "sinc depth 64", not realtime.	WAV	Realtime quality as the old Fruityloops, but the audio export has been improved even more, wicked.
Fruityloops Rendered output: with method "sinc depth 64", not realtime.	WAV	With "sinc depth 64" as rendering method everything's cool.
Steinberg Halion 2 Resampling: Best, Full Quality Slider	WAV	Not very convincing, even with the High-Quality settings and audio export.
MOTU Mach Five 1.2	WAV	Great interface and mediocre sound quality, too bad.
Creamware Pulsar STS 4000 Sampler	WAV	Not much better than Buzz, but a nice rolloff for the high frequencies.
Modplug Tracker Updated (2001-05-08): Aliasing fixed in Version 1.14	WAV	Was okay before, very good since version 1.14. Thanks to the author for improving the aliasing.
Native Instruments Reaktor Sample quality excellent, Version 2.3	WAV	Same problems as Buzz and the Creamware Sampler.
Soundblaster live! (created a Soundfont with the Vienna software and played through MIDI)	WAV	Very good realtime quality. Too bad the E-MU Chip inside doesn't get a great interface.
E-MU ESI 4000 Turbo	WAV	Some aliasing. Thanks to Cycom for sending the file.
Akai S3000 XL	WAV	Not bad, but still some rough aliasing. Thanks to Mainframe / Precision for sending.
Akai Z8 Thanks for Rajah Patel for sending the file.	WAV	Nearly perfect for realtime output, some quiet aliasing on certain notes.
E-MU E4X	WAV	Funny - nearly no aliasing except on one(!) note. Otherwise excellent! Thanks to The Green Man / Basswerk for sending the file.
Vsampler 3.1	WAV	Ultra Mode The interface got better since 2.5 and the "perfect" and "ultra" modes are the icing on the cake - perfect! Great work guys.
Renoise	WAV	Perfect when rendering.
Madtracker	WAV	Great with export setting "sinc interpolation". Now you have two (Renoise & Madtracker) world-class Trackers to choose from :-)
Shortcircuit 1.0.15	WAV	Very nice! (if not excellent)
Yamaha A4000	WAV	Sounds okay, has some aliasing, alright.