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jalevinemd
Senior Member
Username: jalevinemd

Post Number: 944
Registered: 12-2003
Posted on Wednesday, June 04, 2014 - 11:16 am:   Edit Post

Is an "envelope filter" the same thing as an "autowah?"
sonicus
Senior Member
Username: sonicus

Post Number: 3416
Registered: 5-2009
Posted on Wednesday, June 04, 2014 - 11:50 am:   Edit Post

Yes Sir . In the vernacular of some circles of folks.
tom_z
Senior Member
Username: tom_z

Post Number: 629
Registered: 7-2004
Posted on Wednesday, June 04, 2014 - 3:02 pm:   Edit Post

Re-release of the original Mu-Tron III. I haven't heard one, but it looks like the real deal. Love my original Mu-Tron lll.

Cheers,
Tom
hieronymous
Senior Member
Username: hieronymous

Post Number: 1367
Registered: 1-2005
Posted on Wednesday, June 04, 2014 - 3:13 pm:   Edit Post

I have also heard "envelope follower." I think "envelope filter" is the most descriptive term, since it refers to the envelope reacting to the input volume and adjusting the filter accordingly.
jalevinemd
Senior Member
Username: jalevinemd

Post Number: 945
Registered: 12-2003
Posted on Wednesday, June 04, 2014 - 7:39 pm:   Edit Post

Thanks guys.

Yeah, Tom...I've heard good things about the new ones.
growlypants
Member
Username: growlypants

Post Number: 84
Registered: 3-2011
Posted on Thursday, June 05, 2014 - 7:03 am:   Edit Post

Hmm. Guess I stand corrected - here, I thought Autowah was just some city in Canada....
cje
Intermediate Member
Username: cje

Post Number: 151
Registered: 5-2009
Posted on Thursday, June 05, 2014 - 7:22 pm:   Edit Post

There is a difference. With an envelope filter, the effect is in response to the amplitude of the incoming signal. With an auto wah, the effect is more-or-less determined by a rate setting (this would be analogous to how fast you rocked an actual wah pedal with your foot) and possibly a depth setting - which also does not vary based on amplitude.

This is why an envelope filter is generally a more expressive sounding effect - it reacts to your playing.
sonicus
Senior Member
Username: sonicus

Post Number: 3419
Registered: 5-2009
Posted on Friday, June 06, 2014 - 8:56 am:   Edit Post

Hello cje, I hope that you are well ___

Please post a link to a product that exactly conforms to your described parameters _____________.

http://en.wikipedia.org/wiki/Auto-wah

http://www.pedalspluseffectswarehouse.com/Auto_Wah_Envelope_Filter_Pedals_s/201.htm


http://www.rukind.com/forum/viewtopic.php?f=319&t=5028
cje
Intermediate Member
Username: cje

Post Number: 152
Registered: 5-2009
Posted on Friday, June 06, 2014 - 10:32 am:   Edit Post

Hey Wolf,

Without getting nuts with links, if you just look at the controls of a classic "envelope filter" (MuTron III) and those of a classic "auto-wah" (Boss AW-2), one of the key differences is the auto-wah has a rate control - similar to the rate control of something like a tremolo, phaser, etc... If you let a chord ring out on an envelope filter, you will get a single 'quack' (alteration of the ADSR envelope). If you let that same chord ring out on a true auto-wah, you will hear the effect cycle over and over at a specific rate, as if you are rocking a wah pedal back and forth - and the effect is not following the envelope of the input signal.

Now while it may be true that the amount of 'wah' effect is determined by the amplitude of the signal coming into an auto-wah (but this might not be the case for EVERY auto-wah), I believe the defining elements that make an envelope filter a bonafide auto-wah are the presence of a rate control and the fact that the effect cycles through the filter sweep independent of input signal.

If you go to YouTube and watch...

OK, OK... I will post one link!!

http://www.youtube.com/watch?v=B8_MA200Fjc

This is a Boss auto-wah, and throughout the clip you will see it do things that something like the mighty MuTron III just cannot accomplish - that is, mimic a wah pedal.

...and this leads us back to TERMINOLOGY... We would be more correct in referring to these two effect types as auto-wah and envelope FOLLOWER (since they both are very clearly filters).

Everything we are talking about here is an envelope filter. MuTrons and the like are envelope followers, and Boss AW-2s are auto-wah effects.

GENUS - filtrum envelopus
SPECIES - followaeus envelopus OR wah automaticus!!
hieronymous
Senior Member
Username: hieronymous

Post Number: 1368
Registered: 1-2005
Posted on Friday, June 06, 2014 - 10:57 am:   Edit Post

I don't think of "auto wah" as that technical a term - it could refer to either type of effect (envelope follower or sine wave). Maybe that's the point - different manufactures may use different terms, there is no industry standard for a lot of these terms.

Given that, I have used the effect with Moog stuff - the sine-wave from the CP-251 controlling the filter of the MF-101 low-pass filter (which "normally" functions as an envelope filter but is actually extremely flexible) - I call it the "purr bass":

https://soundcloud.com/hieronymous-seven/king-cat-jam
sonicus
Senior Member
Username: sonicus

Post Number: 3420
Registered: 5-2009
Posted on Friday, June 06, 2014 - 11:01 am:   Edit Post

Yes . Ok, AND that is WHY in my first response in my post #3416, I wrote;
" in the vernacular of some circles of folks"
Because within the terminology " Auto -Wah " exists a possible debate and issue of semantics because it is NOT technical terminology. Thank you very much :-) . I have had this discussion somewhere else before . It almost make me have a DEJA- VU!
cje
Intermediate Member
Username: cje

Post Number: 153
Registered: 5-2009
Posted on Saturday, June 07, 2014 - 8:23 am:   Edit Post

Maybe to answer the original poster's question in its simplest form:

An auto-wah is one type of envelope filter.

I too have had this discussion a few times! I bet a lot of us have!

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