Any auto filter aficionados care to tackle this one? John Mayer coaxes some beautiful tones with the help of some kind of auto filter on "I Don't Trust Myself (With Loving You)" from the "Continuum" album. His recent performance of the tune on Austin City Limits really expanded on these sounds. I use a ToneFactor 442 Analogue Filter and can't even get in the ballpark. I'm sure it has more to do with technique than any particular box. Any ideas? Anyone?