Posts Tagged eurorack

Plan B Model 10 – Polyphonic Envelope

Plan B Model 10

The PlanB model 10 is a multifunctional module, not only a simple envelope.
The name “polyphonic envelope” does not describe the functions of this great module, the reason why they called it “polyphonic” is because it can output 4 different type of voltage “envelope” at the same time.
In fact the M10 is way more versatile than an envelope, this is really similar to the Bananalogue VCS module, a multitask voltage controlled cv generator .

The main task is the ENVELOPE.
The envelope consist of an AD env with RISE (0.5 ms-5 min attack)and FALL (0.5 ms – 5 min decay/release) controlled not by gate signals but by Triggers.
The attack and decay time can stretched x8 times their duration with the TIMEBASE control knob (so the complete envelope can last from 0.5 milliseconds to 20 minutes).
You can stretch the time manually just turning the knob or controlling it with the VC TB (voltage control timebase).
The VC TB can act in positive or negative, so it can add or subtract.
Than there is the level of the env, which is bipolar too , so it can act as a positive or inverted envelope.
On the left there are the 5 connectors for the 4 different envelopes generated:

  • EOC
  • EOA
  • RAMP
  • 2x AD (with ad contour switch)

The AD acts as the classic “trig” envelope, with 3 different contour (log, lin, exp).
The RAMP is a ramp with rise time 2x the RISE control time.
The EOA is a sustained square which falls when receive a trig and performs the AD cycle  at the “End Of Attack”.
The EOC acts as the EOA but the AD starts at the End Of Contour.

LFO MODE

The rise-fall cycle can be looped and can also work as an lfo.
Using the rise and fall it can produce various waveform between the tri, square, saw, ramp…
The interesting thing is that the timebase knob can control the time of the lfo, so it a vc lfo, the other thing that can lead to creative results is the fact that the rate of the lfo is not controlled by the timebase only, but it ’s a mix of the rise and fall time.
So the shorter is the R&F the faster will be the lfo rate.

VCO MODE

The third interesting mode is the vco function.
The module has a  triangle-core , so it can sound useful even as a vco.
To get the vco mode  you have to switch into LFO and use fast R&F time and “tune” the oscillator with the timebase function and VC TB to control it with a keyboard cv.
It does not reach very high frequencies but can be used on the low and mid range as an audio modulator or a audio source.

TIPS:
I noticed two useful tips:

  • As the core is a TRI-core the envelope create a sort of clip when, reached the max value,start the fall.
    To avoid the clip it’s useful to use a lowpass filter post the VCA.
  • In LFO mode don’t connect any source to the trig in because the summing of the two sources can damage the module , too high voltage!

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Modular synthesis for dummies!

I’m writing an easy tutorial about modular synthesis , both sw and hw.

You can find it here.

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Analogue Solutions SY02 – Multimode Filter review

Analogue Solutions SY02 Multimode Filter VCA

Analogue Solutions SY02 Multimode Filter VCA

I’m a great fan of the Korg MS-20, as it’s one of my favourite synths ever, so I decided to expand my modular with an MS-20 filter clone.
There are many emulators/clones in eurorack format for the Korg filter, but I focused on three modules:

  • Doepfer X-treme filter
  • Malekko (Wiard) Borg (Buchla-Korg)
  • Analogue Solutions SY02

I like the Borg but it works only as a multimode filter that can out put only one signal, so it’s quite limited.
The Doepfer is interesting but I found the ASOL the more versatile and at the same time interesting  as carachter.
The first thing to say that  THIS IS NOT THE MS-20 FILTER!
In its way it can have common caracteristics and sounds very similar but it’s not the same.

The module has a vertical row of connections for CVand audio INs on the left and the knobs on the right.
There is a an INPUT LEVEL to adjust the gain for the incoming sounds, that useful to saturate or lead the filters to overdrive.
On the left there are 2 AUDIO IN .
Than there is the HIGHPASS Filter section with

  • Cutoff
  • Resonance
  • HPF CV

The HPF CV has 2 CV in the first is attenuated by the knob while the second has no attenuation control.

The LOWPASS Filter section has the same controls:

  • Cutoff
  • Resonance
  • LPF CV

As for the HPF even the LPF filter has 2 cv in and only the first is attenuated by the LPF CV.

There is aslso a VCA section with :

  • Initial Level
  • Volume
  • Audio out (minijack)

The VCA has its 2 CV IN not attenuated.

This module is the FILTER/VCA section usedon the Analogue Solutions VOSTOK too, the construction is solid and the VCA it’s a really good add o this filter.
The filters have a really particular response , tryng to emulate the Korg MS-20 filters/VCA, and the input gain is the key to get smooth sounds  or enter in noise territory.
I’ve patched the synth in a very simple way to understand clearly the behaviour of this module.
I’ve patched only the first vco (from my MFB OSC02) directly into the first audio in of the sy02, used the MFB Dual ADSR to control the vca ancd the LPF.
With a low input level the sound is really mellow and “japanese”, smooth and deep.
As I turn the input level clockwise, the waveform gain in volume and in saturation until “distortion”.
Distorion is like a good overdriven sound , not a clear distortion.
As the filter , with a low input level flows into the filters they react quite smoothly and the resonance has a pleasant harmonic sound but reaches only little aggressive tones.
As the input level grows the filters start to saturate and overdrive the sound, and using ring mod with saw sources it creates a particular clipping , like if it would cut and drive the peaks of the saw waves.
A really interesting trick that every MS-20 user knows is using the HPF as a frequency booster.
In fact the resonance of the HPF can produce a really big amount of sub frequencies  usable to fatten up the sound.
If the HPF is controlled with the tracking of the keyboard  it can create very powerful SUB basses.

Behond the FILTERS  there’s a good (in my opinion) VCA that concurs to give a strong carachter to the module.
The VCA does not ave a superfast response or a extra dynamic behaviour, but it’s very warm and full, really musical!
For me it’s very important for a module to be “musical” because too often a modular synth can do amazing noises but cannot play a bass sound , and that’s quite absurd.
Doepfer modules  (like the A-132-3 DVCA I own) have a cleaner sound and more volume but are less musical (in my opinion but maybe you will like it), and I find this useful for percussive sounds or effects and less pleasant for melodic sounds.

Back to the SY02 , I’m really happy with this module, it has a certain retrò/MS-20 touch, but it also has a carachter of its own.
I really recommend it to everyone looking for a japanese touch in his modular sounds!

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Eurorack vs Roland System-100 audio demos (part2)

MFB OSC 02

MFB OSC 02

Yesterday I tested the MFB VCO and the MFB Dual ADSR with my Roland System100 mod 102, during the test I did some demo recordings.
The demos are quite long and in every demo I used the same “sequence” and tweaked the knobs to let you hear the behaviour of the system.
As the melody is quite redundant  I hope you don’t get annoyed and focalize your attenction on the sounds.

  • VCO MFB with Roland filter
    The MFB VCO (only one vco) passes trhu the Roland System100  filter.
    First I use a saw wave then a square without any modulation and play with the filter to show as the the two modules interact.
  • VCO MFB with System100 and MFB Dual ADSR
    The MFB VCO pass thru the Roland filter and the MFB env modulates the Roland filter cutoff.
    It starsts with a saw wave , than at 1’30 I switch to the PWM and continue playing with the filter and with the MFB env.
    At 4’50 I turn the Roland VCO volume up…
  • VCO PWM (Roland System100 vs MFB)
    Here’s a comparison between the two vco passing thru the Roland System100.
    They both produce the PWM with a similar rate, the MFB sounds a bit harder, it may need an attenuator for PW mod…
    The first is the Roland and the second is the MFB

PAY ATTENCTION!!
When you listen to the sound keep the volume at a fixed level, don’t turn up the volume when some sounds seem more quiet because there are some resonance peaks that can DAMAGE your speakers and your EARS!

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