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synth menu

The Synth menu allows you to adjust the sound of each selected preset individually. It also lets you change the behavior of the sliders and pedals for that sound. It contains the following tabs: 

macros tab : tweak predefined macros for subtle to drastic changes to the sound of the preset
global fx tab :  select the preset’s global reverb or delay effect and adjust its parameters
eq tab : access a shelving equalizer to change the frequency balance between lows and highs
comp & gain tab : configure the pre-gain, the compressor settings, and the post-gain
voice tab : set the pitch slider range
assign tab : define the parameters controlled by the modulation slider and the pedals.

 ℹ If you wish to save the changes you have made, use the save tab inside the presets menu.

macros tab

The first tab in the synth menu gives access to up to 6 sound macros that are predefined by the sound designers during preset creation. A single macro can modulate multiple parameters in Osmose’s modular sound engine at once, allowing for subtle to drastic changes to the sound of a preset. 


The choice of macros offered will be different depending on the preset type. It may include envelope times, cutoff values, FM ratios, etc. Presets that share the same type and character tag will have similar macros to play with. Find below some examples of basic macros you will come across often: 

analog-style and fm sounds 

timbre changes the tone of the sound source, adding more or fewer harmonics.

fmAmt is the amount of FM synthesis applied to the sound, generating complex timbres by modulating the frequency of one sound source with another.

fmRatio changes the FM ratio, the overtones/harmonics relations impacting the timbre of the sound.

cutoff is a filter control for attenuating high or low frequencies of the sound.

envAmt is the amount of envelope applied to the sound when you press the key; it is a form of automation that is triggered by the velocity of your gesture and added on top of the continuous gesture control. 

envTime is the time length of the envelope applied to the sound. You can, for instance, morph from a very long pad with a lot of release to a short, brassy sound.

modulation is a cyclic and automatic variation applied to the whole timbre of the sound. 

physical modeling, acoustic-type sounds

structure changes the harmonics of the sound by controlling the ratio between partials. Depending on the preset, it can morph the sound from a plucked string to something reminiscent of a marimba, a vibraphone…
body modified the tone by crossfading between different eq (convolutions) of instruments and material. For instance, it could morph a woody bamboo flute into something that sounds rather metallic.
resonance changes the decay/release of the sound, from short to long. Low values can sound like dampening or muting the vibration of a string or beam. Not to be confused with filter resonance.

global fx tab

The ‘global fx’ tab allows creating of a sense of space by adding a global time-based effect to the sound. The first parameter selects one of six reverb/delay/echo algorithms. Four FX parameters will vary depending on the effect chosen. Two parameters are always available: 

mix controls the dry/wet of the FX, the amount of sound that passes through the FX.

extend will double the effective maximum delay time by running the effect at a lower sample rate. This means the "wet" part of the signal contains only lower frequencies (below the halfed sample rate), and you have to mix in "dry" to get more highs. In many cases, this sounds pretty natural. Many reverb effects don't do much with high frequencies anyway and will thus work well even when "extended".


The effect algorithms available and their dedicated four parameters are: 



A versatile digital reverb that can mimic small rooms to huge ambient spaces. 

💡try to switch the ‘extend’ parameter to change time but also timbre of this reverb.


diffuse is rather subtle. Depending on the decay time, different diffuse times can make the decay sound smoother or, if wanted, more metallic (ringing). It helps to fine-tune the reverb sound for a maximum quality output. 

damping reduces high-frequency content with each feedback loop in the reverb. The sound gets duller over time.

darkness applies a high-frequency roll-off to the input into the reverb. The sound gets duller immediately.

decay is the amount of decay/reverb time 


mod delay

A modulated delay for chorus and vibrato-like effect. It can sound really atmospheric, creating a very smooth modulated reverb-like sound, but at the expense of obvious early reflections and a pitch tail in the echoes that sweeps a bit.

modDepth is the amount of modulation in the delay
modRate is the rate of the modulation in the delay
feedback is the amount of delay feedback
time is the delay time

swept echo

Another flavor of a delay with modulations. It can achieve more of a flanger-like effect with huge stereo movements.


modDepth is the amount of modulation in the delay

modRate is the rate of the modulation in the delay

feedback is the amount of delay feedback 

time is the delay time

analog echo 

A delay with a more analog-like response. Like vintage echo effects, you can push the feedback to loud oscillations and play with time for crazy SFX.


noise is being added to the delay.

offset is a reverb timing offset between left and right channel (left channel time is the same as right channel time if the offset is 0 but is less when offset is increased; this effect is not a linear time scale but can be noticeable/useful in some situations.)

feedback is the amount of delay feedback 

⚠️ Analog echo can produce very loud feedback when this parameter is increased above a value of 70. Be ready to lower the volume when experimenting with this effect.

time is the delay time

LPF echo / HPF echo 

A clean digital echo with a low or high pass filter for a more focused separation of the delay from the sound source.


LPF or HPF : when LPF is set to zero, it is similar to full damping, and when HPF is set to max, it is like full damping. The LPF and HPF are applied at the very end of the effect signal chain, not inserted in the delay chain. It means the echo is echoing the unfiltered signal internally, and the filtering happens only at the output.

offset is a reverb timing offset between left and right channel (left channel time is the same as left channel time if the offset is 0 but is less when the offset is increased; this effect is not a linear time scale but can be noticeable/useful in some situations).

feedback is the amount of delay feedback 

time is the delay time


💡If you still have a delay-like effect on your sound even with the mix at 0, then a delay-like effect might be programmed directly inside the EaganMatrix to add even more ambiance. A macro (often the 6th) in macros tab should allow you to change the delay time or to remove it entirely.

    In the Haken Editor, global fx are called “Recirculator”.  Effects parameters are also accessible as a modulation destination to add even more variation with LFOs etc.

eq tab

The ‘eq’ tab lets you balance the frequency components of a preset, shaping the sound either subtly or drastically “brighter” or “darker”. 

It is a general tilt equalizer based on a stereo pair of shelving filters with separately controllable low and high frequency components in the range of 120Hz to 15KHz. 

The following parameters are adjustable: 


tilt : Positive values will lead to more highs and fewer lows, negative values will boost lows while highs are attenuated (low and high being relative to the central frequency)

frequency : choice of the central frequency that defines the threshold between lows and highs

mix : dry/wet of the Tilt EQ, allowing parallel equalizing. The equalizer won’t have any effect when the mix is set to 0%.


comp & gain tab

Since Osmose’s sound engine EaganMatrix is a complex, modular synthesizer, modulations to the volume happen at numerous stages in sound design which leads to a possibly huge dynamic range. The ‘comp & gain’ tab allows you to handle the level and tame the dynamics of a preset with gain staging and a compressor.


pregain sets the level that enters the compressor. High values can add global saturation to the audio.

comp. amt is a one-knob control for a light compressor that can keep levels more consistent.*

comp. mix allows mixing the wet and dry signal of the compressor to achieve parallel compression.

postgain changes the overall volume of the sound right after the compressor at the end of the signal chain. Used to manually normalize a preset’s loudness or compensate for too high volume induced by the saturation effects created with the pregain.


  * The compression amount is a macro parameter that controls 3 compressor parameters inside the EaganMatrix at once:
Tweaking the comp. amt from 0 to 127 results in changing the threshold from 127 to 0, the attack from 127 to 0, and the ratio from 0 to 127.


 voice tab

The ‘voice’ tab features only one parameter: the pitch bend range of the pitch slider. Contrarily to note bending on the keys, the slider will affect all played notes as a whole, just like a regular pitch wheel or touch strip would do. 

mod/pedal tab

The ‘mod/pedal’ tab lets you choose the parameters that you control from the modulation slider and the two pedal inputs. These are always global parameters that will influence the sound as a whole, not on a per-note basis.


☝️ Not all pedals are supported, and you need to make sure to calibrate your pedals via the global settings before using them.


The first parameter allows you to select one of the two sources of modulation: 


Pedal 1 is assigned to Sustain by default. Pedal 2 and the Mod Slider will always control the same parameter and are assigned to one of the sound macros by default. 


For each of those two controller sources, you can modify:


assign for selecting the modulation targets like different types of sustain, the synth macros, the effects parameters, and the post gain. For instance, mapping your pedal to the post gain will make it act like a classic volume pedal.

min sets the minimum value controlled

max sets the maximum value controlled

The sustain and sostenuto functions in Osmose work differently compared with regular keyboard instruments. Usually, sustain takes the current pressure/position of the notes played and keeps them in that state. On Osmose, Sustain, and Sostenuto are continuous controls that allow fading and swelling sustained notes when moving the expression pedal. See also: pedal compatibility and recommendations.

  Sostenuto will only sustain notes that were held at the moment you pressed the Sostenuto pedal. It lets you hold one or several "drone" notes with your pedal and then lets you use both hands to play another part without any sustain on top. If you assign the two pedals to sostenuto 1 and sostenuto 2, respectively, you can hold and fade two sets of sostenuto notes at the same time.

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  • 03-Apr-2024