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 Forum index » Discussion » Composition
Feedback instruments / no-input mixer / zero-input mixer
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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Sun Apr 24, 2016 6:40 pm    Post subject:
Subject description: March 19, 2016 ZIM video
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Here is the video of the ZIM piece from the March 19, 2016 Kutztown Planetarium evening, with yours truly on zero input mixers, Genevieve Smith on the JAWS reader, and Emily Hoch on visual accompaniment generated from the audio via a Processing sketch that I wrote for the June 2015 2-day conference, and which she performed for ZIM there as well. I just watched/listened to this for a second time, and am really pleased with how the set turned out. Thanks to Steve Mokris for recording and posting this set.
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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Wed May 18, 2016 4:22 pm    Post subject:
Subject description: tuned post-processing on ZIM signals
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I have been experimenting with various kind of post-processing FX in Live, downstream from my 3 mixers. All feedback-driven signal generation is in the mixers, with Live FX post-processing downstream from the mixers. The idea is to be able to tickle characteristics of a Live FX without taking hands off the mixer.

Here is a simple example. (I am saving the rest up for the summer solstice webcast.) Tune the stereo pair in my mixer, one to high pitch and the other to low pitch, and then send them to a filtered delay in Live. In the pictured delay I have knocked the mid-range out all together (gain = -infinity), and set the high frequency range to echo at 3 times the period of the low frequency range, giving me multiple rhythms.To get anything out of a delay, things need to change from time to time. Otherwise you just have sustain.

It was necessary to make the feedback higher on the faster delay, otherwise it decays much faster than the other.

You can then sweep pitch from the mixer, manually or using mixer FX, to vary the effect. You could put the Live patch's delays on a foot controller, so as to keep hands on the mixer. I haven't done that yet. This recording just illustrates the basic idea.


zim3to1Live.png
 Description:
The Live patch
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zim3to1Live.png



zim3to1Waves.png
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The waveforms of the recording
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zim3to1Waves.png



zim3to1.mp3
 Description:
The sample recording

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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Fri May 27, 2016 4:16 pm    Post subject:
Subject description: Friday Night Cheddar
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Practicin' up for Summer Solstice on a 3 ZIM Salad with Live Dressing. I didn't think it went 20 minutes. Cool


FridayNightCheddar.mp3
 Description:
Friday Night Cheddar

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Blue Hell
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Joined: Apr 03, 2004
Posts: 22503
Location: The Netherlands, Enschede
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PostPosted: Tue Jun 07, 2016 6:29 am    Post subject:
Subject description: Friday Night Cheddar
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Acoustic Interloper wrote:
Practicin' up for Summer Solstice on a 3 ZIM Salad with Live Dressing. I didn't think it went 20 minutes. Cool


Barely so - but another nice number Laughing

Nice track!

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Jan
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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Tue Jun 07, 2016 8:18 am    Post subject:
Subject description: Friday Night Cheddar
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Blue Hell wrote:
Acoustic Interloper wrote:
Practicin' up for Summer Solstice on a 3 ZIM Salad with Live Dressing. I didn't think it went 20 minutes. Cool


Barely so - but another nice number Laughing

Nice track!

Thanks again, Jan! I have a 62-minute whopper cooked up for either June Solstice or a One-Off radio set. The second week in May, after classes let out, is always a burst of pent-up music for me, so I just turned on the recording during three live improv sessions with the mixers, cut out the four best sections with no over-dub or other editing, and voilà: From the No World (The No World Symphony). I am eager to stream it. Very Happy

Thanks for listening.

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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Sun Jun 26, 2016 9:33 am    Post subject:
Subject description: From the No World
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Posted my June 2016 Solstice piece From the No World over here on the Solstice thread. There is a photo of the rig and a discussion of that piece on the first page of the event thread. I always look forward to playing the solstice events during my breaks from teaching. Very Happy
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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Fri Jun 23, 2017 12:29 pm    Post subject:
Subject description: Channel panning in zero-input mixer
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Oh, look, it's been a year! Cool

Attached is a short recording of an exercise. I used the Allen & Heath ZED 12Fx mixer with the Nux Mod Core's PAN effect in the stereo feedback path. Channel 1 on the mixer is set to generate the lower pitch, channel 2 to the higher. I used the ZED's fx unit to add some reverb on the outgoing signal, not in the feedback path, because I like it.

Think about panning for a moment. At the start the PAN is set to slowest rate and 100% dry, so no PAN. The channels are isolated, and just play their mixer-equalizer-determined pitches.

Here is the sequence of PAN parameter changes during this recording:

Start — feedback pan on lowest rate and driest wet : dry ratio.
The two channels run without interacting.
Ramp up wet : dry to 100% wet by 15 seconds.
You get one or the other resonant frequency, not both.
At 1 minute start ramping up pan rate.
At 1:13 the low pitch goes away due to shortened “resonant chamber”.
Rate maximum at 1:30, Slow it back down , at 1:59 back into low mode.
Around 2:10 is automatically shifts between a low-high and
a medium-high pair of pitches.
At 2:52 slow rate, at 3:00 increase it to max at 3:18.
Finally back wet : dry down at dry after 3:20.

In essence, a fast, 100% wet pan interleaves both channels almost simultaneously into one channel, but it switches so fast that the long/low pitches never have time to develop. The part "Around 2:10 is automatically shifts between a low-high and a medium-high pair of pitches." is the most interesting, because it is at a panning boundary where it snaps back & forth between two semi-stable modes of operation without any human interaction. Those state transition regions are always the most interesting in playing ZIM.

Ping-pong delays also interleave the channels to interesting effect. The Mod Core doesn't have that, but the Pan gives a similar, albeit more continuous effect.


Panning170623_00.mp3
 Description:
PAN mixer exercise per above description, 3:41 duration, Dale E. Parson

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L´Andratté



Joined: Sep 23, 2012
Posts: 127
Location: Hamburg, Germany
Audio files: 5

PostPosted: Thu Mar 22, 2018 12:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, A.I., hell of a thread, thanks for the interesting documents, listened just to TheFinalFive, but from beginning to end and I loved it.
It sounds like synthesis with a very organic/acoustic/"real" touch like a field recording Very Happy

I have always felt drawn toward minimalistic forms- gotta read all this stuff now and suck up some new inspiration.
Thanks
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Acoustic Interloper



Joined: Jul 07, 2007
Posts: 1957
Location: Berks County, PA
Audio files: 82

PostPosted: Fri Mar 23, 2018 9:13 am    Post subject: Reply with quote  Mark this post and the followings unread

L´Andratté wrote:
Wow, A.I., hell of a thread, thanks for the interesting documents, listened just to TheFinalFive, but from beginning to end and I loved it.
It sounds like synthesis with a very organic/acoustic/"real" touch like a field recording Very Happy

I have always felt drawn toward minimalistic forms- gotta read all this stuff now and suck up some new inspiration.
Thanks


Glad you like it. Very Happy Analog synthesis at its core. From the No World (The No World Symphony) from June 2016 webcast is my favorite no-input mixer + post-mixer-effects so far. I will be playing some ZIM in the mix tomorrow, Saturday 24 March at 17:00 GMT, for the equinox webcast. I haven't had much time to prep, so tomorrow's will be extremely improvised. Cool http://radio.electro-music.com

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