posted 03 November 2008 23:04            

I've put a program on the Twiki that creates bandlimited wavetables from ordinary Kyma wavetables (the 4096-sample variety). The program creates 11 wavetables from each wavetable in the input file(s). The 11 new wavetables are concatenated into a single output file. The first of the 11 wavetables is simply the original wavetable. The remaining wavetables have decreasing amounts of high-frequency content, until the 11th, which will ordinarily be a simple sine wave. The idea is that the I+1th wavetable can be played one octave higher than the Ith without aliasing.

There is an oscillator included in the archive, for playing back wavetables in this form. It uses !KeyPitch to figure out the right wavetable. There is an !Aliasing control that you can use to offset the chosen index. If you want even less high frequency content coming out of the oscillator, give the !Aliasing variable a negative value. If the oscillator is removing too much high frequency energy for your taste, then give !Aliasing a positive value.

The generated wavetables are normalized to 90% of full scale, but this can be controlled with the -M option to the program. Run it with -h to get a help display.

This is a command-line program! No GUI .

-Luddy