shorten some of the multisamples that came with that and osc them up
Here's an easy method for creating oscillators from wavfiles much longer than 3000 samples. Keep in mind that long sample conversion will add to the processing overhead, so trim the files down to the bare minimum.
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Open up a text editor (Notepad), and drop in the following line:
<region> sample=SAMPLE FILE NAME.wav oscillator=on
Substitute the proper file name for SAMPLE FILE NAME, and save it with an .sfz file extension. Place both the SAMPLE FILE NAME.sfz and SAMPLE FILE NAME.wav files next to each other in Rapture's Multisamples folder.
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Now you have a single wavfile pulling double-duty. The .wav alone will play back at recorded pitch on middle C / MIDI Note 60, as a "one-shot". It will be transposed, shortened or lengthened at other MIDI note locations. The companion .sfz file will 'compress' the .wav characteristics into an oscillator. This wavetable won't sound much like the original wavfile, but it will yield some very interesting results.
I happen to like the results derived from complex targets, such as an open hi-hat sample. But any source is fair game. It can be a loop, pure noise, vocals, etc. The first page of that "Purebred Wavetables" document (linked above) pictures a series of 10 sine .wavs played in descending succession over 10 octaves. When converted into an oscillator, it sounds like a cascading sweep of overtones / harmonics.