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 Classic Auto-Filter by Kjaerhus Audio is a Virtual Effect Audio Plugin. It functions as a VST Plugin.
Classic Auto-Filter
Product Classic Auto-Filter
Developer Kjaerhus Audio
Price (MSRP)
No Longer Available
Type / Tags Filter
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
- Released
Miscellaneous Information
Copy ProtectionNone

Classic Auto-Filter is an analog modeled four-pole filter with resonance control. It can be used for creative effects like auto-wah-wah and filter sweeps, as well as a fixed filter for equalizing purposes. The filter is selectable between low-pass, high-pass, band-pass and band-reject (notch). The filter cut-off frequency can be modulated from the envelope follower and the LFO.


  • Modulated four pole filter with resonance.
  • Syncable LFO with sine, random-hold and stereo spread.
  • Envelope follower with adjustable attack and release.
  • Presets.
  • Very low CPU usage.
  • Supports sampling rates on and above 44100 Hz.
  • Full VST automation.
Latest User Reviews Average user rating of 4.00 from 2 reviews

Reviewed By DjHuge2k
March 6, 2007

The Classic Auto-Filter by Kjaerhus Audio is one of the most pristine filters out there. It is very clean and straight to the point. This plug-in is a freeware with fantastic sound. There are many filters out there that cost a lot of money and do a lot of more cool tricks, this is a Classic Filter.

Once again the sound is phenomenal and with such an easy to use interface a twelve year old can use, it’s worth checking out. This acts like a real hardware filter and programmed accordingly.

A few minor setbacks would be the lack of presets. But if you’re an experienced sound engineer you will know this is not a problem for The Classic Auto-Filter. It offers all your basic filter types like LP HP BP and BR. The filter cut-off frequency can be modulated from the envelope follower and the LFO. The silk precision of the frequency knob makes this filter my most used tool.

In a nutshell if you’re looking to cutoff your baseline with a sick HP or to fade in your lead(s) with a classic LP envelope, this baby is for you.Read more

Reviewed By liars&ashes
February 25, 2005

----This thing is great for a freebee,there are filters that do a lot more,but they cost,quite a bit for a good one really,and they give this one away free,how can you go wrong.
----4 types of filters,lfo,mix and resonance,it's fairly straight ahead,but that's a plus if you ask me,easy to use = useful in my book.
----Cpu usage on my Athlon 2400 is very low.
----I need to add 700 more words here apparently....
----Let's see,I can't think of anything you might not want to try this out on,anything from drum loops,to synth parts,anything that could benefit from some color & motion could be improved with a filter like this.
----Stability-wise,it's never crashed Fruity Loops on me,and like I said above,very low cpu usage in all cases.
----If anything,I'd like to see a few more filter types,or a *mixer* to blend between filter types maybe,but that's just nitpicking for a freebee.
----190 more words needed,hmm....
----Well,try it out,I check out 50%+ of all the freebee synths & effects that get listed on KvR,and this is one of maybe 15-20,(out of literally hundreds),that I've kept around. Until,or unless,you can afford some big name filter with 8,000 modulators and 6,000 factory presets,you can't go wrong having this one around meanwhile.Read more


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Classic Auto-Filter

Average user rating of 4.00 from 2 reviews

Kjaerhus Audio
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