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Astronaut Modular

 is a eurorack version of the Astronaut III space 

reverb. Astronaut III has gained a worldwide following as a 

multifunctional reverb pedal for guitar and bass. Now, it has been 

adapted to eurorack modular systems: we have reworked the form 

factor, retained all the original features, and added CV control over 

certain parameters. The whole sonic palette of the Astronaut III (ranging 

from traditional reverb patches to complex acoustic structures and 

arpeggios) is available in the Astronaut Modular. The module has 22 

algorithms along with the Hold (infinite sustain) mode. The Astronaut 

Modular is a true inspiration machine!

 

 

Controls

1. The 

VOLUME

 knob controls the MIX OUT volume (with an option to 

boost the signal).

2. The 

MIX

 knob controls the ratio between the wet and dry signals at 

MIX OUT.

3. The 

PROGRAM

 knob selects algorithms within a bank.

4. The 

BANK

 button switches between the two banks.

5. The 

DECAY

 knob controls the size and spatial/acoustic parameters of 

the selected algorithm. It controls reverb decay length as well as 

feedback in certain algorithms (read more in the “List of Algorithms” 

section).

6. The 

CHARACTER

 knob controls an extra parameter of the selected 

algorithm (read more in the “List of Algorithms” section).

7. The 

HOLD

 button activates Hold Mode (infinite sustain) when pressed 

and held. 

Connections

• IN

 is a mono input for the incoming signal. 

• MIX OUT

 is a mono output for the dry/wet mix (the ratio is controlled 

by the MIX knob).

• WET OUT

 is a mono output for the wet signal only.

• CHARACTER CV

 is an input for CV control over the CHARACTER knob 

(10Vptp). 

• HOLD CV

 is an input for CV control over the HOLD button. The effect 

is the same as holding the button. The input is set to a +2V threshold.

• DECAY CV

 is an input for CV control over the DECAY knob (10Vptp). 

In case of CV control, the DECAY and CHARACTER knobs set the middle 

point of their respective parameters and the control voltage shifts that 

point within a ±5V range. When the DECAY and/or CHARACTER knob is 

set fully counterclockwise, CV will only increase the setting; if the knob 

is set fully clockwise, CV will only decrease the setting. 
The WET and MIX outs can be used simultaneously.

LED Indication

Upon startup, the LEDs indicate the selected bank:

• 

LEDs glow white: Bank 1 is selected.

• 

LEDs glow blue: Bank 2 is selected.

When 

Hold Mode

 is active, the LEDs flash and spin in a circle.

www.shift-line.com/

amodular

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01

02
03
04
05
06
07
08
09

10

11

BANK 2 | BLUE

PROGRAM

Plate
Modulated
SkyNet
ShimUp
ShimDown
Universe M-1
Eva Min Arp
Eva Random Arp
Mechanics Delay
Reverse Delay
Force OctDn

DECAY

Decay
Decay
Decay
Decay
Decay
Decay
Decay
Decay

Delay+Fbk

Feedback

Not Used

CHARACTER

Pre-delay

Rate

LPF
LPF

HPF

Phase Rate

Rate
Rate

LPF

Delay Time

Detune

BANK 1 | WHITE

CHARACTER

Pre-delay

HPF
HPF

LPF
LPF

Flange Rate 

Rate
Rate
Rate

Delay Time

LPF

DECAY

Decay
Decay
Decay
Decay
Decay
Decay
Decay
Decay

Depth+Mix

Feedback

Not Used

PROGRAM

Room
Spring
SkyNet-2
ShimUp-2
ShimUpDown
Universe M-2
Eva Maj Arp
Eva Octave Arp
Cm-112 StepFlt
Ping-Pong Delay
Force Roar

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