Patch Tips#18 - ADSR 'Free-Run'

Using a gate delay and comparator to trigger 'full length' ADSR runs, achieve looping ADSRs and delayed looping of AD envelopes. As suggested in this thread.



Unlike AD envelopes, ADSRs generally need a gate signal to fully complete their cycle. The gate determines the duration of the sustain phase of the envelope's run. So, what to do if your sequencer only generates triggers?

With a gate delay like the A-162, set the delay to zero and the length to taste. If using Maths' channel 1, the rise sets the delay time and the fall the length of the gate, available at the EOR. This provides the gate that the sustain requires. This mimics the response of AD envelopes like the VCS, which complete regardless of gate duration.

If you then mult that gate to a comparator with a suitable threshold, you'll get a second gate when the first expires. I used the Sport Modulator with the multed gate fed to the bottom input and 5V as a threshold reference sent to the top input. The middle output provides the comparator function. Mix the two gates and feed them to the input of the gate delay and you've got a looping ADSR.



The A-162 is great for these sorts of tricks and can also be used with AD envelopes which have an End Out (VCS, Maths, A-143-1) to achieve the Envelator's delayed looping.

Clash of the Borgs

A quick comparison of the Malekko Wiard Borg 1 & 2, also featuring Plan B Models 12 & 13.



The Borg 1 (white knobs) employs slower vactrols, allegedly giving it a mellower sound and longer decay than the more aggressive, black knobbed Borg 2. I'm a big fan of the Plan B Model 12, but sometimes find it's response to CVs either too linear or lazy, so I was keen to hear the Borg 1 for myself.

Here's a fairly representative recording of the difference between these filters:


(Borg 2, Borg 1, Model 12)

I really liked the Borg 1's soft edges and muted tones. Its response is slower than the Borg 2 and this makes it a more natural sounding LPG. It might even have the edge on the M13, which tends to lose the initial transients. I don't find either Borg particularly useful for BP or HP duties and this is where the M12 shines. I tried patching both Borgs in a BP series, but didn't find the results as interesting as the dual-peak BP mode of the Cwejman MMF-1. That said, both Borgs are fantastic LPFs with attitude and character. Sonically, the B1 sits squarely between its more aggressive sibling and the rubber-funk of the M12.

You can download the full set of recordings, including the obligatory LPG 'thwap' test, here (3.2MB), but be careful with your speakers on the 'rumble' MP3!

Thanks to Schneidersbuero for the loan of the module.

Patch of the Day - Harmonyhertz

I twisted my knee and had to undergo an MRI scan this week. For those of you who haven't had the pleasure, this is what it sounds like:

Harmonyhertz-PotD  by  navs

Having entered the machine, you're given a pair of noise-canceling headphones. The classical music that is piped through these is supposed to calm and distract you from the grunts and buzzes generated by the scanner. Don't know which device was responsible, but the kick and hi-hat pattern was a bizarre counterpoint. Sort of like a Clockwork Orange warehouse party. Someone with a sense of humour at Siemens, the company that built the contraption, decided to call it 'Harmony'. The nurse told me that the larger unit is called 'Symphony'.

THE PATCH

The patch features four voices: kick and hi-hat, ring modulated squarewaves, FM klunk and some 'ducked' classical music. Although I managed to use up nearly all of my patch cables, it was actually fairly straightforward.

Drums: MMF-1 sine wave kick, M12-filtered-noise hat. LFO provides rhythm, VCS provides gate delay for 'swing'.

Buzz: Wogglebug stepped out provides slow pitch changes for VCO-2RM. Two square waves, with a touch of XMod and manual pitch and PWM tweaking, are output from the ring modulator. Timing is generated by the burst out of the WB which is patched to a clock divider. The /8 gate signal triggers one Maths channel. An inverse /8 gate is fed to a second Maths EG so that the klunks are timed to occur after each buzz has sounded.

Klunk: M15 & AFG lin FM plus some pitch woggle and envelope thwapping from Maths and the mix out of an A-143-1. Maths' EOC used to trigger the Doepfer, klunk gated by M13 LPG.

Classical: Borg-filtered with a bit of FM from the combined buzz & klunk CVs. Vactrol speed in evidence as the CV takes a while to fade away from it's peak.

Ducking: this was achieved by sending the classical sample to the first channel of an A-134-2 VC Xfader, the audio mix of buzz and klunk to the second and applying the combined buzz and klunk CVs to the (asymmetrical) Xfader.

Hope you enjoyed the sounds and remember to look after yourselves!

This PotD dedicated with thanks to the docs and nurses.

Patch of the Day - Long Way Down

Something gentle for a Sunday afternoon:

PotD_longwaydown  by  navs

Live, four-voice patch with manual tweaks.

Self-oscillating Cwejman MMF-1 dual-peak sine modulated by WB smooth out. A-Sol SH-NZ noise to Plan B Model 12 HPF, VCA VC'd by Doepfer A-147 VCLFO sine, itself VC'd by the output of a A-156 Quantizer. Ring Mod output of a VCO-2RM filtered by a Malekko/ Wiard Borg, envelope from Bananalogue/ Serge VCS VC'd by Woggle out. M15 VCO (linFM) gets WB stepped, gated by M10 envelope which is triggered by WB burst and VC'd by stepped out. M10 EOC to A-142 envelope which provides the voltage which is then quantized by the A-156.

Patches. They always start out simple, don't they ...

Borg, Boogie & the Thwap Test

I only went to Schneiders yesterday to pick up a second Doepfer mixer...



Enjoy the recordings.


Borg Low Pass. Starts in LPG mode, then manual tweaks.


Borg Modes. EG + Manual tweaks


Boogie Modes. EG + sequenced/ random CV of mix relationships (Cwejman VCA-4MX).



I also borrowed a Makenoise QMMG to run a quick 'Thwap' test.



For some, the gold standard in Euro is still the Plan B Model 13. Decide for yourself.


LPG Thwap Test. M13, Borg, QMMG.

VCO and envelope were multed to the three LPGs. The Borg, QMMG & M13 all use different vactrols with different response times, so I adjusted the modulation depth until I got a similar timbre. The M13 was used as the 'control' i.e. offset at zero, MD at full.

Thanks to Schneidersbuero for the loan of the modules.