Metabolic Devices Moonwalker Manuel utilisateur

metabolic devices

Figure 1a shows how phase offset affects the phase offset output in

unipolar and bipolar modes, as well as the reference waveform output

Figure 1b shows how phase offset affects the outputs when attack and

decay rates are not equal.

Figure 2 shows how inhibit affects the output

Moonwalker is an extremely flexible signal generator that can act as an

envelope generator, LFO, or audio oscillator. Perhaps the most uniquely

defining characteristic of Moonwalker is the Phase Offset parameter

which moves the start and end of the waveform to any point in the cycle.

There are however a number of other unique features that set it apart.

This manual starts by covering the basics of how to use Moonwalker in

the 3 most common configurations. We’ll then dive in to Phase Offset,

explaining what it does and how to use it. Finally we’ll discuss some

advanced use cases that really exploit the feature set.

For the purposes of these sections Phase Offset will not be discussed

and as such the output can be taken from either the Phase Offset or the

Reference outputs without any notable difference. Be aware that once

phase offset has been adjusted to anything other than null, the outputs

are not the same. The differences will be discussed in detail later in the

section on phase offset.

Moonwalker as an envelope:

When Moonwalker is first turned on it is in one-shot mode as used when

generating envelopes, so let’s start here. For envelopes, set mid or low

frequency range active, Phase Offset output mode to unipolar, and plug

a trigger source into the trigger input. Start with the phase offset at mini-

mum and it’s cv attenuverter to 12:00, patch the phase offset output to

the destination of choice, and set attack and decay times to taste.

NOTE: it is very important to null the phase offset cv attenuverter

even if nothing is plugged into it! There is a powerful feature here that

can lead to confusing behavior during the learning process. When in

doubt, plug a cable into the cv input jack with the other end floating or

grounded (0v). We’ll discuss this feature in detail later.

Use the

Attack

knob to set how long it takes to go from 0v to 10v. A posi-

tive voltage at the Attack cv input will increase the attack time, while a

negative voltage will decrease it. The amount of modulation can be atten-

uated or attenuated & inverted using the cv attenuverter.

The

Reverse / Alternate Attack & Decay

button provides a handy

way to audition how an envelope would sound with the attack and decay

times swapped. When the led is on, the Attack controls are now assigned

to Decay, and the Decay controls are now assigned to Attack. When

alternating, Moonwalker will generate the envelope with Attack & Decay

rates as normal, and then swap them when the next trigger is received.

They are returned to normal on the next trigger, and the pattern contin-

ues to alternate between normal and swapped as long as this mode is

enabled. A short button press enables reverse, and a long press enables

the alternating mode. Button presses take effect on the next trigger so

as not to interrupt playback.

The

Not Decay

output goes to +5v when Moonwalker is not in the decay

segment of the Reference Output. This includes the time when Moon-

Use the

Decay

knob to set how long it takes to go from 10v to 0v. A posi-

tive voltage at the Decay cv input will increase the decay time, while a

negative voltage will decrease it. The amount of modulation can be atten-

uated or attenuated & inverted using the cv attenuverter.

Plug a trigger source into the

Trigger Input

on Moonwalker, or if you

don’t have a trigger source ready you can use the Manual button on

Moonwalker to trigger it. Once it has been triggered, Moonwalker will

ignore additional triggers until it completes it’s cycle. This can be very

handy for deriving slow moving events from a master clock and works like

a clock divider based on absolute time rather than number of clock

pulses.

If the

Retrigger

button is enabled Moonwalker will react to all incoming

triggers, resetting the envelope to the starting amplitude each time a trig-

ger is received. Enable this when you want Moonwalker to be more active,

and to cut off longer notes when a new note happens before the old one

is finished.

The

Volt Per Octave

input can be used to modulate both attack and

decay at the same time and change the overall frequency. A typical patch

would take the v/oct that drives the vco here, so that higher pitches have

shorter envelopes while lower notes are longer.

Just as in envelope mode, a trigger in the

Trigger input

with

Retrigger

enabled will reset Moonwalker to the beginning amplitude. This allows

Moonwalker to be synchronized with an external clock regardless of the

frequency it’s running at. A slower clock that syncs Moonwalker every

bar or two can be a cool way to give some form to an LFO that is at a

different tempo than the clock. Synchronizing it every bar or two creates

a recognizable pattern out of what would otherwise be an unrelated free

running LFO.

Without Retrigger enabled, the

Trigger Input

now pays attention to how

long the input is held high. A gate in the trigger input will

Inhibit

the LFO

as long as the pulse is high. Inhibit drives the waveform in a direction

and at a rate determined by the attack / decay rates.

walker is inactive, so it goes high after decay is finished and stays high

during steady state and until attack is finished. It is at 0v during decay. It

can be used as a logic source to enable effects or routing during only a

portion of the event. It can also be used to chain multiple Moonwalkers

to create very complex envelopes.

Moonwalker as an LFO:

Tap the

Cycle

button to use Moonwalker as a low frequency oscillator.

Use the

Attack

knob to set how long it takes to go from 0v to 10v. A pos-

itive voltage at the Attack cv input will increase the attack time, while a

negative voltage will decrease it. The amount of modulation can be

attenuated or attenuated & inverted using the cv attenuverter.

Use the

Decay

knob to set how long it takes to go from 10v to 0v. A posi-

tive voltage at the Decay cv input will increase the decay time, while a

negative voltage will decrease it. The amount of modulation can be

attenuated or attenuated & inverted using the cv attenuverter.

The

Volt Per Octave input

can be used to modulate both attack and

decay at the same time and change the overall frequency. The response

here is inverted to that of the attack and decay inputs, meaning that a

positive voltage will increase the frequency while a negative voltage will

decrease it.

The

Reverse / Alternate Attack & Decay

button provides a handy

way to audition how an LFO would sound with the attack and decay

times swapped. When the led is on, the Attack controls are now assigned

to Decay, and the Decay controls are now assigned to Attack. When

alternating, Moonwalker will generate the envelope with Attack & Decay

times as normal, and then swap them on the next cycle. They are

returned to normal on the next cycle, and the pattern continues to alter-

nate between normal and swapped as long as this mode is enabled. As

a free running LFO, alternating mode effectively makes Attack & Decay

frequency controls for two consecutive waveforms. A short button press

enables reverse, and a long press enables the alternating mode. Button

presses take effect on the next trigger so as not to interrupt playback.

The

Not Decay Output

is the pulse wave output of Moonwalker so it

provides a hard edge switching LFO signal rather than the sloped LFO

available at the Reference and Phase Offset outputs. It goes to +5v when

Moonwalker is in the attack segment of the Reference Output and to 0v

during decay.

The

Manual Trigger

button can be used to activate

Inhibit

when a trig-

ger source is not available.

In the top part of the Attack / Decay range, the

Inhibit

rate is relatively

fast and moves towards 0v where it will hold until the inhibit pulse goes

low. In the middle of the range it will move very slowly in either direction

and will look like plateaus in the waveform. In the lower part of the range

it will move towards 10v and the effect is lessened because we are

already at the end of the range.

Activating

Inhibit

is a great way to add complexity and interest to a

repeating LFO. To get stepped waveforms, drive inhibit with the pulse out

from another LFO and set it’s width to very wide. Set the Moonwalker

frequency fairly fast, but set the other LFO 3 or 4 times faster. Sync the

other LFO using the Not Decay out from Moonwalker to get a consistent

number of steps for every cycle and start them at the same time. If you

modulate the frequency of both LFO’s using their v/oct inputs, the

number of pulses per cycle stays consistent.

A trigger in the

Trigger Input

with

Hard Sync

enabled will reset Moon-

walker to the beginning amplitude. Syncing Moonwalker to another VCO

in this way can create additional harmonics for a brighter sound. Be sure

and patch the volt per octave to both modules if you want to keep the

shape and amplitude the same for different frequencies.

With

Hard Sync disabled

, the

Trigger Input

now becomes a gate

input that carves into the waveform for added harmonic complexity. A

pulse in the Trigger Input will

Inhibit

Moonwalker as long as the pulse

is high. Inhibit will drive the waveform in a direction and at a rate deter-

mined by Moonwalker’s frequency.

In the top part of the frequency range, the inhibit rate is relatively fast

and moves towards 0v like a reversal in direction. In the middle of the

frequency range it will move very slow in either direction and will look

like plateaus in the waveform. In the lower part of the range it will move

towards 10v and the effect is lessened because we are already at the

end of the range. Experimentation with the relative frequency and pulse

width of the pulse source is encouraged.

Moonwalker as an Audio VCO:

If we now switch our frequency range to audio, Moonwalker is ready to

be used as an audio source.

The

Attack and Decay knob range

is limited from about 750Hz to

20Hz to provide increased resolution for tuning, in light of the absence

of a fine tune control. Moonwalker can still generate frequencies across

the entire audio range, however it must be driven through the volt per

octave input.

Set the frequency and shape of the waveform using the Attack and

Decay controls. Modulation of Attack and Decay work just like in the

other modes, however modulation of the

Volt Per Octave

input should

be used by those concerned with staying in tune. A positive voltage at

the volt per octave input will increase the frequency while a negative volt-

age will decrease it.

Moonwalker tracks pitch accurately from roughly 5kHz to 15Hz.

Phase Offset:

Now that we’re familar with how to set up Moonwalker in the most

common ways, let’s take a closer look at the Phase Offset parameter.

Phase defines where in the cycle the envelope / oscillator starts and

ends, or more specifically it defines the start / end amplitude and direc-

tion of travel.

Imagine our waveform is sitting on a table exactly it’s size. We are going

to push the waveform over the edge of the table and as soon as any mol-

ecule passes the edge of the table, it is instantly transported to the

beginning of the table.

To get stepped waveforms, drive inhibit with the pulse out from another

VCO. Set it’s width to very wide and the frequency several times faster

than Moonwalker. Plug the pulse out from Moonwalker to the sync input

on the other VCO to get a consistent number of steps for every cycle and

start them at the same time. Be sure to patch the volt per octave control

signal to both modules in order to keep a consistent tone.

The

Reverse Attack & Decay

button won’t have much of an effect at

audio rate, but enabling the

Alternating mode

will drop the frequency

by an octave, so long as Attack and Decay are not equal.

A short button press enables reverse, and a long press enables the

alternating mode. At audio rate it is unfortunately difficult to visually

detect which mode we are in. The only way to know for sure is to press

the button. Button presses are quantized to the reset of the waveform so

switching octaves will not generate any unpleasant transients, and can

be used in a performative way.

The

Not Decay Output

is the pulse wave output of Moonwalker so it

provides a pulse wave audio signal rather than the sloped signal avail-

able at the Reference and Phase Offset outputs. It goes to +5v when

Moonwalker is in the attack segment of the Reference Output and to 0v

during decay. Pulse width modulation inherently changes the frequency,

but PWM without changing the frequency is possible using Phase Offset

and is discussed in a later section.

Moonwalker can invert the polarity of the modulation in this fashion, but

also offers the ability to invert the shape while keeping the voltage range

the same.

When driving a VCA, Moonwalker can transform from a normal VCA

response to a ducking VCA response. When driving a Panner, Moonwalk-

er maintains the full range of panning modulation regardless of the

initial pan position which can change at any time. These are just two of

the countless applications where adjusting the Phase Offset opens up

new avenues of exploration.

In the sections that follow, we’ll discuss in detail how the Phase Offset

works, philosophy on how to apply it effectively, as well as some patch

ideas and advanced techniques.

Moonwalker has two sloped outputs. The

Phase Offset Output

gener-

ates a signal whose phase can be continuously offset from 0º to 360º

and this is where the action is most of the time. The

Reference Output

doesn’t change phase but provides a “normal” signal to which the phase

offset signal can be compared. Well, almost normal. We want our refer-

ence signal to always move at the same rate as our offset signal, so it

changes from attack to decay rate at the same time as the phase offset

signal. This brings it’s own unique action which we’ll cover later.

Below are descriptions of Moonwalker’s outputs at a few different

settings. A visual depiction of this can be seen in Figure 1a/1b.

The Phase Offset Output in Unipolar Mode always outputs a signal

between 0v and 10v but the start / end amplitude, and direction change.

If we set phase to 0º (7:00) or 360º (5:00) the phase offset output

will be sitting at 0v. When triggered, the phase offset envelope will

rise to 10v at attack rate, and fall to 0v at decay rate just like a

normal envelope.

If we set phase to 90º (9:30) the phase offset output will now be

sitting at 5v. When triggered, the phase offset envelope will rise to

10v at attack rate, fall to 0v at decay rate, and go back up to 5v at

attack rate.

If we set phase to 180º (12:00) the phase offset output will now be

sitting at 10v. When triggered, the phase offset envelope will fall to

0v at decay rate, and go back up to 10v at attack rate.

If we set phase to 270º (2:30) the phase offset output will now be

sitting at 5v. When triggered, the phase offset envelope will fall to 0v

at decay rate, rise to 10v at attack rate, and go back down to 5v at

decay rate.

The Phase Offset Output in Bipolar Mode outputs a 10v peak to peak

signal between -10v and +10v. The phase is offset just like in unipolar

mode but the start / end- amplitude changes that come with phase

changes are nulled so we always start and end at 0v.

If we set phase to 0º (7:00) or 360º (5:00) the phase offset output

will be sitting at 0v. When triggered, the phase offset envelope will

rise to 10v at attack rate and fall to 0v at decay rate just like a

normal envelope.

If we set phase to 90º (9:30) the phase offset output will rise from

0v to 5v at attack rate, then fall from 5v to -5v at decay rate, then

back up to 0v at attack rate.

If we set phase to 180º (12:00) tthe phase offset output will fall from

0v to -10v at the decay rate, and rise from -10v to 0v at the attack

rate.

If we set phase to 270º (2:30) the phase offset output will fall from

0v to -5v at the decay rate, then from -5v to +5v at attack rate, and

back down to 0v at decay rate.

The Reference Output always starts at 0v, rises to 10v, and falls back to

0v, but it follows the Attack / Decay rate changes of the Phase Offset

Output to ensure it’s modulation is perfectly synchronous with the Phase

Offset Output.

If we set phase to 0º (7:00) or 360º (5:00) the reference output will

rise from 0v to 10v at the attack rate, and fall from 10v to 0v at the

decay rate, just like a normal envelope.

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