Filter
rfilter = T("rfilter", type="lpf", cutoff=800, Q=0.5, depth=0.5, ...);
// type [String] Filter type
// cutoff [Object] {kr-only}
// Q [Object] {kr-only}
// depth [Object] {kr-only}
// ... Input objects which will be added and processed
rfilter.type // [String]
rfilter.cutoff // [Object]
rfilter.Q // [Object]
rfilter.depth // [Object]
// The filter class has some aliases.
T("rlpf") // Low pass filter
T("rhpf") // High pass filter
T("rbpf") // Band pass filter
T("rbrf") // Band reject filter