memorymoon
FAQ
FILTER
Level: This is balance control for the 2
filters. It is also on/off switches for the filters. (Set volum 0V to
save CPU). It is also gain settting for the built in overdrive in filter
2.
Cutoff: Frequencies lower than this setting will pass the filter.
(Lowpassfilter). Emphasis=Resonance. Gives more emphasis to the
frequency set as cutoff frequency. Emphasis and KB Track is common for
both filters.
KB track: Makes the highest notes brighter. It
is a cutoff frequency compensation. Mode: Filter 1 can be in lowpass,
bandpass, highpass or notch mode.
Filter1 cutoff is not realtime (calculated for every 4th sample), and
this might cause clicks with fast envelope, and it is most noticeable in
bandpass mode.
Filter2 has large amounts of built-in distortion to enchance the
sound.
Contour=Envelope.
Affects how the sound develop over time. Here is how to adjust an effect patch
using the filter contour:
For a rising effect: Choose attack 6 volts. For a
falling effect: Set attack to 0 and decay to 6 volts. Attack is the rising time, decay
is the falling time. Sustain is the level after the envelope is finished
and you still hold down a key. Release is the fade out time after the
key is released.
Contour amount is level for the filter envelope.
You can select the filtermodel for filter 2. It is basically 15
filter models with fast (low CPU)
versions of all filter models. The
default model is 4-1:5. The 4:4 filter has a smoother resonance.
This is what the developer Rick Jelliffe says about the different
filter configurations:
* The configurations with an "f" are fast versions which do
not model analog component variation. the components without
an "f" model the .5-5% variations in values of the discrete resistors
and capacitors of old real analog components and may be quite CPU
intensive. The modes which do not have an "f" are designed to
distort well: Users may prefer to drive over the customary levels. (In
memorymoog the filter2 level).
* The configurations are typically named using two numbers
divided by a ":".
The first number represents how
many filter stages (called "poles" probably innaccurately) the signal
goes through before it is sent to the output. The second number
represents how many stages the signal goes through before it is fed
back into resonance. So "4:4 pole" is nominally more like a Moog
24db/8ve filter, while "2:2 pole" is nominally more like an
Oberheim 12 db/8ve filter. (To my ear, however, the "4:5" and
"2:3" filters do better emulations.)
* There are a few configurations where before the ":" are two
numbers separated by the minus sign "-". In these cases, the
number after the "-" represents one or more small high-pass stage added,
which makes the filter like a lop-sided band-pass filter. So
"4-1:5f" means that the output signal is the result of four low pass
stages and one high pass stage, and that the resonance is
based on 5 stages.
You can make the graphic envelopes visible with this button:
And it looks like this:
The envelope section has a lot of options:
Return to zero: Retrigger envelopes each time you hit a new note.
Complete cycle: Complete attack and release stages.
Keyb. follow: Shorter sounds in the highest ranges. (Like a piano).
Release: Release stage off/on
Curve: How the signal moves from one stage
to the next. Linear is standard in most digital synths, but the old analog
synthesizers had very musical curves. I think inv. exp+exp curve is the original memorymoog curve.
MODULATION
LFO
Rate: Speed from 0.1 to 100 Hz.
Sync: Sync to host clock. Overrides rate knob when on.
Level is also available in control section: "Wheel LFO"
SH-waveform may be used as a random generator.
The lower row is destinations:
OSC1 FRQ: Oscillator1 pitch
SOUNDFONT: Soundfont oscillator pitch
PW1: Oscillator 1 pulse wave modulation. (Pulse length).
FILTER1: Filter 1 cutoff frequency.
Voice-LFO: Osc 3 and filter envelope used as modulation signal.
The levels of osc 3 and filter envelope is mixed and used as
modulation signal.
Contoured osc amount: Filter envelope modulates the modulation
signal.
Invert: The modulation signal is inverted.
The lower row is destinations:
VCF1 PAN: Pan modulation of filter 1
Osc2 ring: Modulation signal sent to osc 2 as ring modulation.
"Drift" in Osc 1 section is controlled by Voice-LFO.
CONTROL
Page 1 Edit (All controls in one view).
Page 2 Keyboard
Page 3 Soundfont/Drumloop edit.
Autotune: Affects osc2 (pitch and fine-tune)
osc3 fine tune and master tune. Brings the instrument back in perfect
tune.
Bend amount: Bend interval in semitones.
Wheel LFO rate: Modwheel increases LFO rate.
CPU-save: All soundcards sent to only one filter
(instead of 6 filters). Only one filter and one filter envelope. If you
think the keyboard respone is weird: Turn it off. If you experience too
much distortion in filter 2: Turn it off. (Filter 2 has built in
overdrive, and 6 voicecards into filter 2 is a bit too much. Use
filter 1 instead when CPU save is on.)
Mono: Mono/Unison mode on. 6 voice poly when
turned off. Next to the mono button: Select priority and the
number of unison voices from 1 to 6.
Octave shift: At strong velocity the osc
pitch is one octave higher.
Wheel osc2: This is a weird control intended for
distortion. Osc2 is 5 semitones lower when mod wheel is at
zero position (for power chords). 'When modwheel is at max osc2 pitch is
normal.
Panic: Send "all notes off" midi messages to all
parts of the synth.
Wheel LFO: LFO level controlled from modwheel.
Foot LFO: LFO level controlled from foot pedal.
After filter: Aftertouch increases filter cutoff
frequency.
AMP velocity: Velocity controls output level and
envelope speed.
FILTER velocity:
Velocity controls filter cotoff
frequency.
OSCILLATOR SETTINGS
On top of the synth you can select the square waveform:
(Square (PW), Noise (BPF), Bi-Pulse (PW), Morph
Triangle,Saw-Square.)
The default square is "Square (PW)". All selectable
waveforms do morphing from PWM modulation:
Square (PW): Pulse width
Noise (BPF): Sets the resonance of the bandpass filter
Bi-pulse (PW): Pulse width
Morph Triangle: Pulse width
Saw-Square: Set's the ratio between Sawtooth and Square wave
Low: Osc 3 in low mode. Used when osc3 is modulation signal in the
Voice-LFO section. The pitch is 5 octaves lower in low mode.
Keyb. control: When on incoming midi messages will control the pitch
of osc3. When off osc3 is free running. When on in low mode each
voicecard will have different Voice-LFO speed.
Sync: Sync to host tempo.
Detune: Each voicecard has different pitch.
Pulse: Each voicecard has different pulse.
VCA: Each voicecard has different level.
Filter: Each voicecard has different cutoff frequency. (Does not work
in "CPU-save" mode.)
OSC DETUNE: Detuning of the individual waves in each oscillator.
MIXER:
Each oscillator + the noise generator has a level knob in the mixer.
Range is 0 - 10 Volt. Note that over 5 volt is overdrive, and the sound
will be smoother instead of louder above 5 volts.
SYNC
This button forces the pich of oscillator 2 to follow the pitch of
oscillator 1. So you set the pitch for OSC 2 in the OSC 1 section. The
trick is to sweep the pitch of OSC 2 with the LFO, so that the sync gets
some pitch-variations to work with.
GATE / ARP SECTION
What you see above is gate off/on switch and tempo control.
Tempo control is also sent to LFO sync, Osc3 sync and Delay sync.
Speed: How the tempo is divided for use with the
gate and arp. The LFO, Osc3 and delay has its own divide controls.
Sync: Sync to host clock. Use this setting when you compose songs.
Off mode is intended for live use.
The other controls is for live use:
Foot tap: Tap tempo with sustain pedal intead of the tap button.
Tap 4 times: The tap tempo button.
BPM: Actual speed display.
Tempo slider: You can use this instead of the tap button when sync is
off.
Lenght: Note length. Full is 100%
Octaves: The arpeggiator will work with 1 - 4 octaves.
Hold: Use this in addition to the hold button in the control section.
First row: Step 1 - 16 off/on
Second row: Can be sent to filter cutoff or oscillator
frequency. (Not to osc3).
Third row: Can
be sent to filter cutoff or oscillator frequency. (Not to osc3).
PAGE
Page1: Edit page. All controls in one view.
Page2: Keyboard page.
Page3: Soundfont and monitor page.
SOUNDFONT PAGE
How to load a soundfont: Click the (load) text
to the left. The soundfont is remembered with patch. Also remember to
turn up volume in the mixer section.
Only one envelope is available and can be turned
off/on for both the amp and filter.First row is amp. Second row is filter+hold-function.
The last row is the .wav-player. It is always in
loop mode.
File-loop: Use the loop preprogrammed into the
wav-file. (If there is one).
OVERDRIVE
This is distortion. When set
to off, the signal is bypassed, and that will reduce CPU-load.
Before filter is overdive both before filter 1
and filter 2. Because overdrive must be calculated for 6 voices, and for
2 filters (when both filters levels is higher than 0 volt) it must be calculated for 12 voices
in poly mode.So the "before filter" option is very CPU hungry.
When you increase the gain
knob, the sound will become more and more like a square wave.
Overs 2x: This is 2 times oversampling.
High cut: Will remove the highest frequencies.
This is like a speaker simulator. A
guitar amp does not have much energy
above 5 kHz. With a middle setting (5V) this knob emulates a speaker cabinet.
At max setting the sound is clean and uncoloured. High cut does
not work when distortion is in "before filter" mode.
DELAY
Sync=Syncronization
with host clock. Set sync speed with note values.
Sync off: Set speed with SPEED knob.
Right speed 1X: Only one delay is
active. This saves CPU.
Right speed 2X: This activates a second delay. A
delay-signal with double speed is sent to right output, while the first delay is
sent to left output. If you raise the feedback value the result will be
ping-pong delay.
Feedback=Number of repetitions.
MODULATION EFFECTS
Modulation: off/on and select chorus or phaser.
Level: Dry/Vet balance. 10V is 50% chorus and
100% phaser.
Speed: Modulation speed.
Phazer resonance: The phazer has a resonance control.
REVERB
Size: The room size.
Decay: The reverb length. Similar to delay feedback.
CPU ADVICE:
There are off/on switches connected to the level knobs. Because of
that you should always make sure that unused parts of the synths have
zero level.
AUDIO QUALITY
Oversampling is
implemented in the oscillators. MinBlep saw is 64 times oversampled. The synth works
internally at 32 bit. It automatically syncs to your soundcard sampling rate. So
you can oversample the whole synth by setting the soundcard at 96kHz.
memorymoon manual (faq page in pdf format).
vintage orginal morymoog user manual in pdf-format.
picture of memorymoon MIDI control.
memorymoon MIDI control list.
Please send me patches if you have created some. I am always interested.
Have
fun!
Best regards
Gunnar.
