#77 Add a new HP/LP filter type (not the same as bandpass!)

[unfa]

The idea comes form dula filter plugins such as Pilgrim.

It's basically two filters controlled with a single knob.

When the frequency control is at 50%, the signal is unaffected.

If it's turned down, a lowpass filter is stating to cut off the top of the spectrum, until it removes all sound when the knob is at 0%.

When the knob is turned up, a highpass filter kicks in chewing up lower frequencies until the knob reaches 100% and the higpass filter removes all sound.

It's not like a bandapss filter, because the bandpass filter is always going to remove a lot of the sound. The idea is that you can perform a highpass/lowpass sweep with one knob (or LFO) easily.

The type ofg the filters used could be both non-resonant and resonant (HP/LP1, HP/LP2 etc).

[Mark McCurry]

Interesting idea

[Mark McCurry]

There was another issue here from friedolino which this might be merged with post migration.