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Post by funbun on Sept 14, 2020 14:31:13 GMT
I'm wanting to get some of those phase effects that Steve Reich did back in the 1960/70s. I know a trigger delay would be perfect, but we don't have that module yet. How could you manually patch a trigger delay?
LFO > Delay (lofi) > SEQ16s?
or
SEQ16 > Delay > LFO > Pingpong MFX?
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Post by MikMo on Sept 14, 2020 16:35:03 GMT
I'm not sure that would work . After a pulse has been through the delay it is probably no longer "square enough" to be considered a pulse.
But it's worth a try.
I would try to make a very short squarewave "ping" sound, run it through the delay, and see if the delayed sound is actually able to act as a trigger. Of course the repeat on the delay should allow for only one repetition of the original sound.
There might be a way to make the logic module "resquare" a sound that has been through the delay, but that is at best a semi qualified guess.
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Post by tIB on Sept 14, 2020 20:07:16 GMT
I'm wanting to get some of those phase effect that Steve Reich did back in the 1960/70s. I know trigger delay would be perfect, but we don't have that module yet. How could you manually patch a trigger delay? LFO > Delay (lofi) > SEQ16s? or SEQ16 > Delay > LFO > Pingpong MFX? End out on the 2env?
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Post by MikMo on Sept 14, 2020 20:24:55 GMT
Had to try it, it actually works. So sqrwave from vco -> VCA drive VCA with very short gate from env / ADSR Output from VCA -> Delay (feedback all counterclockwise, wet/dry all clockwise) then output from delay used to clock TRIQ64 - works! If you need to "regenerate" the delayed pulse you can use the logic module, 5V into 1A, delayed pulse into 1B take "reshaped" pulse from AND output. So "come out" : Mikael / MikMo EDIT: Small clarification here: So the LFO that triggers the ADSR / ENV is the original pulse and the output of the delay is the delayed pulse. I did not try to run the LFO directly to the delay, i doubt it will work, but.....
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Lugia
Wiki Editors
Ridiculously busy...ish.
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Post by Lugia on Sept 15, 2020 1:20:55 GMT
Yeah, that'll "show dem"!
This is interesting...as I recall, this is not too dissimilar from some of the rhythmic trickery Byrne and Eno employed on "My Life In the Bush of Ghosts", which were also reliant on delay lines to shift not only audio sources, but "click" triggers...at least, from the descriptions I recall of the project at its 1980 stages. Which brings up an idea: the pingpong and dual delay settings on the MULTIFX should also yield a good result...and might be able to dispense with the logic aspect, since the MULTIFX uses the Spin chip and is digital...ergo, it should reproduce the pulse wave well enough to directly trigger from its own output. All that's needed is a sharp rise to 5V, after all...
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cpruby
Junior Member
Posts: 73
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Post by cpruby on Sept 15, 2020 2:17:09 GMT
Isn't the Reich stuff just using a repeat that is a few milliseconds shorter than the original? I thought that's how he did the rain and come out pieces. I don't know how to accomplish this with an AE system (others probably could figure it out).
As for something like clapping music, you'd want something to trigger like after 32 "beats" (or pulses from an LFO). And you'd use that to start a phrase or restart a phrase. Wouldn't the beat divider work best? And if you want, you can even feed that through the slew if you want onset or offset.
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Jihel
Full Member
knobs, knobs, and knobs !
Posts: 241
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Post by Jihel on Sept 15, 2020 5:09:53 GMT
Steve Reich uses tape-recorders for his original piece Come Out.
"Reich re-recorded the fragment "come out to show them" on two channels, which initially play in unison. They quickly slip out of sync to produce a phase shifting effect, characteristic of Reich's early works. Gradually, the discrepancy widens and becomes a reverberation and, later, almost a canon. The two voices then split into four, looped continuously, then eight, until the actual words are unintelligible." (album notes).
With today technology, a looper (or a delay with loop fonction) slightly modulated can recreate this effect.
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Post by funbun on Sept 15, 2020 15:16:31 GMT
Yeah, that's one reason I'm hoping for a trigger delay and a sample player with a loop function. Also the phasing I'm thinking about is more like Piano Phase, Reed Phase and Violin Phase. He accomplished these by having two players play exactly the same line, then one player either play a touch faster, or adds or leaves out a notes to start the phasing. In my latest album I tried using the step reset on the SEQ16 and TRIG164, but I never got any true phasing. It was more like beat shifting, and polyrhythms. I love the polyrythm effect especially when driving the resonance to get even more complex superimposed rhythms. That was cool, and like that, but I really want true phasing. It sound like it's possible. Time to get to patching!
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Post by MikMo on Sept 15, 2020 16:49:04 GMT
To get phasing i think the time difference between the two sounds playing should be shorter than one sequencer step. Try the technique i outlined above.
Mikael / MikMo
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Post by funbun on Sept 15, 2020 18:14:11 GMT
I did it! It does work! I did it about the same, but used the low pass gate instead of a pure VCA. Works brilliantly! Gonna use this one as my submission to the community project.
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Post by MikMo on Sept 15, 2020 18:32:36 GMT
Awesome. Many trigger / gate inputs requires a sharp rising edge of a incoming signal to detect it as a trigger, so i was afraid that the signal coming out of the delay would be to "blurred". It's a really cool feature of the Æ that both audio signals and control signals are 0-5V. This opens up possibilities that would not normally be present.
Mikael / MikMo
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Post by young Protoboard on Sept 16, 2020 1:15:55 GMT
I'm wanting to get some of those phase effect that Steve Reich did back in the 1960/70s. I know trigger delay would be perfect, but we don't have that module yet. How could you manually patch a trigger delay? LFO > Delay (lofi) > SEQ16s? or SEQ16 > Delay > LFO > Pingpong MFX? End out on the 2env? tIB gets my vote. Their solution uses one-half of one module and has both manual and CV control over the delay time. Very elegant, very clever. Heck, you could use the second ENV to create a third signal from the second, if you wanted to layer those signal trains up. Or, instead of chaining in series, both can be used in parallel (by duplicating the first implementation) to create two independently-controlled delayed trigger signals.
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Post by funbun on Sept 16, 2020 1:17:47 GMT
Yeah, the low-fi delay has like three inputs plus a CV control. Tons of things to explore there.
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Lugia
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Ridiculously busy...ish.
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Post by Lugia on Sept 16, 2020 1:42:51 GMT
From what I know of the huge box of plexiglass, knobs, and wires, it's actually a "playable" analog delay network using early BBD chips. Note the quotes there, though; Reich himself noted in an interview in the mid-1970s that the device was used only once (which is where the pic was shot), and the rest of the time it sat on his mantle at home. Controllability issues sidelined it, apparently.
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Post by funbun on Sept 16, 2020 1:45:13 GMT
Talk about dreaming of wires!
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Post by young Protoboard on Sept 16, 2020 2:10:35 GMT
From what I know of the huge box of plexiglass, knobs, and wires, it's actually a "playable" analog delay network using early BBD chips.
... I don't mean to derail the thread, but does ANYONE know where I can find BBD chips these days? From my research, all production was finished by the 90's, and there is no elegant purely-analog solution to the problem of delaying an analog signal (outside of tape loops and the kludged-together capacitor-switch train that I scribbled out before I realized that BBD chips were the exact same thing but with 100x the capacitors). Similarly, the only place I could find a PT2399 (my next best bet) in stock was Reverb, but again, not truly analog. (Now that I think about it, it's likely that it's a digital chip gives the DELAY module its "lo-fi" character, as it is built around the PT2399.) As funbun mentioned, the DELAY module has a lot of capability and is great to have freed up outside of the proposed patch solutions. I especially love the meta sort-of parallel; we all have likely at least 2 envelope generators in 2ENV to use, but DELAY is almost always more sparse in our AEM racks, just like how BBD chips, the PT2399, and any "simple" audio delay solutions are hard to come by.
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Post by MikMo on Sept 16, 2020 10:13:23 GMT
The PT2399 is not so hard to source. Actually the AE delay is using it. I have a handfull of the DIP PT2399 chips from way back, but you can still get them from ALI and other sources. You can get a MN3207 BBD clone here: www.banzaimusic.com/BL3207.htmlAnd musicding in Germany has a bunch of delay chips, including 3207 and 2399: www.musikding.de/Delay-Reverb_1They are mostly sold buy guitar effects DIY places as they are used in phasers / flanger /chorus style pedals Mikael
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namke
wonkystuff
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Posts: 686
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Post by namke on Sept 16, 2020 12:58:30 GMT
There are some coolaudio BBD chips available — e.g. from electricdruid.net (the V3208 part)
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