butt~ butt~ is a dirty filter! Actually, it is a simple biquadratic filter (band-pass/band-reject/highpass/lowpass), with a dirtiness factor... at some frequency, it sounds a bit like a vinyl scratch. In version 2, the code is highly optimized for Altivec.	Format : External Environment : msp freeware Max 4.6 http://www.no-tv.org/MaxMSP/