Audiotool board archive

Autofilter

olosch · started 2017-07-06 09:09 · updated 2023-03-01 13:21 · closed

The autofilter is a filter that can have its cut-off frequency altered either by the inputed signal or by its side-chain input (if used).

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#attack - How fast the filter movement will reach its maximum depth.
#release - How fast the filter will move back to its initial frequency (see frequency).
#hold - Sets the duration the filter will stay at its maximum depth.
#gain - Boosts the gain of the signal.
#filter mode - The filter has 4 Modes: lowpass, lowpass inverted, hipass and hipass inverted.
#frequency - This parameter allows control over the filter's cut-off frequency.
#resonance - Allows control over the filter's resonance. NOTE: Don't turn it up too much, possible damage to your ears and mind.
#depth - Depth and direction of the filter movement.
#threshold - The threshold sets the filter's sensitivity, when will the the filter movement start.
#dry/wet - The dry/wet parameter lets you blend between the original (dry) and the filtered signal (wet). Turning the dry/wet to 0% will mean that the signal will pass through the device unchanged.
#side-chain - If a second signal is inputed into the autofilter's side-chain then the filter will react on the side-chain input instead of the main input signal.

Comments (17)

anonymous user
2017-12-09 13:55 · 2017-12-09

anyone found a use for this thing yet?

anonymous user
2017-12-09 13:56 · 2017-12-09

btw is this basically like a frequency compressor?

anonymous user · reply
2017-12-09 13:57 · 2017-12-09

filter compressor instead of gain compressor?

Jordi Moragues · reply
2017-12-09 15:38 · 2017-12-09

I used it to make a vocal effect out of a bass sample on my track "Loudmouth". It's the first sound you hear, which repeats throughout the whole track. You can open the draft and see for yourself. I also have a template "Autofilter on drums" where I show how you can use the resonance over some drum loop to have a whistling sound follow the dynamic of the percussion. It's a very powerful box.

Jordi Moragues · reply
2017-12-09 15:40 · 2017-12-09

It's basically a dynamic filter. The cutoff frequency reacts dynamically to the amplitude of the input/side-chain input signals.

ne.time · reply
2017-12-09 16:43 · 2017-12-09

Example of use : set it on a bass which has some high freq (harmonics, distortion or wtv), in one of the highpass mode (I never remember which one does what) and sidechain it to a kick that's only lowfreq. When your kick comes in the low freq from the bass is cut off resulting in no lo freq clipping without the lost of the high freq elements of your bass. The side chaining effect is super fun to experiment with.

Jordi Moragues · reply
2017-12-09 18:21 · 2017-12-09

Technically a filter is different than a compressor. A compressor, even a multi-band one, will -attenuate- the level of the audio in the relevant frequency band. A filter -filters- it, that is, removes it. They sound different.

anonymous user · reply
2017-12-09 18:22 · 2017-12-09

vvv wow, that's a rly good idea @netime. i always get triggered by frequency interference between the kick and the bass

anonymous user · reply
2017-12-09 18:26 · 2017-12-09

i understand that the process in which it changes the audio is different, i was just saying how the things that trigger the compressor and autofilter are very similar, and it therefore (kinda) produces close to the same effect

Nyenoidz
2020-07-23 23:38 · 2020-07-23

Very handy when you have a bassy mid-bass (or brilliant bass) and you want the low end to be filtered out to clear up space for kicks (sidechain)....this makes sense :thinkky:

8yearale
2021-09-18 16:42 · 2021-09-18

if the attack/release on the synth is long should the filter attack/release be the same or am i having a misudnerstanding?

Jordi Moragues · reply
2021-09-20 00:01 · 2021-09-20

Not necessarily. It really depends on the desired relationship between amplitude movement and filter cutoff movement.

8yearale
2021-09-23 17:06 · 2021-09-23

So if my track doesn't get to, say, 12 db the filter won't start to move? sorry i don't understand the purpose of the 'threshhold' knob, what am i supposed to do with it during production?

Jordi Moragues · reply
2021-09-23 22:02 · 2021-09-23

The threshold sets the signal level above which the filter cutoff frequency will start following it. If the level of the input signal (or side-chain signal) is below the threshold, the filter cutoff won't change. If the level crosses the threshold, the filter cutoff will start following it. Here's a template I did a while ago to illustrate it: https://www.audiotool.com/track/qnyfk9gdjc15cr5grrzqbsieiuyum/

8yearale
2021-11-02 18:08 · 2021-11-02

what is an inverted low pass? :/

Jordi Moragues · reply
2021-11-02 22:57 · 2021-11-02

The inverted versions of the two filters (low pass and hi pass) react inversely to the loudness of the input signal.