Saturday, 18 July 2015

The αρπ Filter (alpha-rho-pi) with a kilpatrick Phenol

The αρπ Filter (alpha-rho-pi) of NLC sounds great. .... very much like the diode ladder used in the Roland TB 303

It's actually a hybrid/variation of the vintage Electronotes and ARP designs. Hard to describe it's sound ... inorganic, man-made (in a good way).


 The filter design has 2 audio inputs, two CV modulation ins and two audio outs (Bandpass & LP).
I'm not aware of NLC's producing a Eurorack version of this great module. So for now, if you want one
you'll have to build athe 4U banana-fied panel  .... it's well worth it.
http://nonlinearcircuits.blogspot.com.au/2012/10/filter-panel-ready-to-shipthis-one-has.html

As you can seen from the pics I'm using just the BP out & one in & one CV mod in.
The CV is being modulated from a jerkoff.



This is a old video using the αρπ Filter:




Kilpatrick Phenol & NLC Divine CMOS

This circuit uses some good old CMOS 4000 chips. To be specific they are 4070s although
the logic chip can also be a 4081, 4077 or a 4001.
[The CD4070 contain four independent (XOR) Exclusive-OR gates].
I understand that Andrew F is a fan of  "Lunetta Synths".

The module takes two input signals and divides them down by /2, /4, /8 & /16.

It also ring modulates the two signals and all of their divisions (similar to the ring mods in the Korg MS-20 and ARP Odyssey). All of these signals can then be mixed to create the output waveform.

This is a early video of one in action with some Serge gear:

There is a Euro version of this and I think Andrew F of NLC is still selling DIY PCBs for this module.
http://nonlinearcircuits.blogspot.com.au/2012/10/filter-panel-ready-to-shipthis-one-has.html


Below are some videos of the Divine CMOS with a Phenol from Kilpatrick.
I'm dividing the harmonics from VCOs 1 & 2.





Thursday, 16 July 2015

Korg KPR 77 Drum

The KPR stands for Korg Programmable Rhythm.
She came out in 1983 and was Korg's response to the Roland 606.

It's very underrated.  Each drum sound's level can be individual mixed via the sliders.
The sliders are just like the ones found on the Roland 707.
It's sounds consist of bass, snare, two toms, open and closed hi-hats, accent and (switchable) cymbal/clap.
The bassdrum is a bit weak in my opinion. The Toms aren't too bad.


Sadly no midi or DinSync- It's a Korg sync Korg uses a 48 ppqn (parts per quarter note) DIN standard whereas Roland's is 24 ppqn. For correct tempo match it is possible to use a clock synchronizer like the KMS-30 or an Arturia Beatstep pro.
- 2 trig outputs (pulses +5V)
- start-stop pedalswitch input
- sync IN / OUT
- tape interface - See more at: http://www.polynominal.com/korg-kpr77/#sthash.YA3fG1Gx.dpuf

Runs on 9V DC (original model KAAC 001) or 4 X 1.5V batteries

- tape interface  

Patterns can be saved to magnetic tape if you have to turn off the machine without batteries.


There is a large display: - used for programming like in the Roland 505 & 626.
There are 2 recording modes: realtime record or step.


There is a accent for each instrument.
We have flam repeats for tom1 & 2. There are also 4 different resolutions:
16th, 16th triplet, 32nd and 32nd triplet


The MEMORY has 48 basic rhythm patterns
- 32 steps for each pattern

There are 6 chain banks divided into Chains 1 & 2 & groups A, B, & C.


The Toms are also great triggers for analog gear. The 2 trig outputs are pulses of +5V ... so quite good for triggering EuroRack modules like envelope generators and Korg Volcas.

1 separate out for snare/claps channelThere is 1 separate out for snare/claps channel.

We also have a start-stop pedalswitch input.
There is 1 separate out for snare/claps channel
 start-stop pedal switch input
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For more info on the history of Korg Drum Machines Click Here

+ KORG KPR-77 Drum - getting started tutorial 

 

Wednesday, 15 July 2015

New Sound Waves - Sunday 12th July Meeting

I had the best Sunday ever.
Lot's of synths and good friends.
Above is a Buchla 200/ 200e - Thanks Paul.


 Monome + Euro = :-)

New Sound Waves live at 107 Projects,
Redfern St, Redfern. Sydney, Australia.
We all got to see  the new Roland AIRA Eurorack gear, thanks to Christian Moraga and Roland Australia.





These meetings  are held every 2 months (on average). Subscribe to the NSWaves blog for more details:

First pics of pluto

Oh Oh ........... :-(

Tuesday, 14 July 2015

Kilpatrick Phenol Synth - First Impressions

This just arrived yesterday. So I did a few quick videos
This second video uses a NLC (NonLinearCircuits) sequencer  - The Bibdubba 1 & 3.

The Phenol is a modular that punches well above it's weight,

 Andrew has done a great job.




The Synthacon - Steiner - Parker

On this page are my blog entries on all Steiner-Parker / Synthacon related subjects.

1. SYNTHACON VCF - CGS 35 build notes
2. Steiner-Parker MicroCon Voice - Eurorack - Build notes

   External Links  
1. Yu Synth VCF
2. Analogue Realities
Steiner Synthasystem DIY
4. The Synthesizer Network