Vermona Retroverb



Vermona (2003-2007)

This is a versatile unit, capable of many interesting sonic creations!

The input stage gives you four options - two with and two without the Accutronics Spring Reverb. Both include the option of flipping the phase of one half of the stereo output - this effect gives the psycho acoustic feeling of the stereo image drastically widening.

Next is The Two Band Equalizer which is warm and well rounded, giving you the option to shape your sound further.

The Voltage Controlled Filter is a potent low pass that can be used in conjunction with the Envelope generator or with an external volume pedal - positively or negatively.

The Envelope Generator is what gets things moving, and what gives the Retroverb plenty of action beyond being a lush spring reverb. You can shake your sound all over the place or add subtle movement to the signal. The Generator can be switched to infinite repeat at a users desired speed giving you a rhythmic layer you can also play on top of.

Guitarist Retro freaks (and people that generally like to jump up and down on pedals) will be delighted with the array of footswitch possibilities on the unit. Connect a volume pedal to control the cut off frequency - gives you an instant and unique wah wah effect, activate the envelope generator - the units excellent sound mangling device, activate the Voltage Controlled filter for drastic eq changes, activate the Voltage controlled Amplifier for crazy volume effects. Or you can of course bypass the whole lot and return to normality.

The name Retroverb deceives the Units possibilities, it is not only a reverb, but also a great eq, and a very dynamic lowpass filter with flexible modulation capabilities. Giving on top of the Vintage Spring Reverb sound, very interesting filter-, wahwah- and tremolo-effects.


The VERMONA Retroverb unifies the classic Spring Reverb sound with a Voltage Controlled Amplifier and Filter, all in one classy wooden panelled housing. This unique combination brings the user a highly flexible and versatile effect, that one will rarely find in another electro - mechanical device.

Spring Reverb

The centre piece of the Retroverb is a Spring 'Hall' Reverb from traditional manufacturers ACCUTRONICS. This spring module (type 9) is hung with six springs, coupled and placed in parallel, resulting in 3 final springs that are roughly 36 centimetres in length. The physical size of the springs and the dedicated effort in construction produces a rich, full reverb effect with a unique character.

Input Section

Next to the GAIN dial is the MODE selector, which will set the ground function of the Retroverb. The following four users modes are available:

  1. Spring, normal - all elements are sent through the signal path, and the outputs operate normally.
  2. Spring, reversed - all elements are sent through the signal path, and the right output is Phase reversed by 180°.
  3. Non-Spring, normal - the Spring Reverb is removed from the signal path, and the outputs operate normally.
  4. Non-Spring, reversed - the Spring Reverb is removed from the signal path, and the right output is Phase reversed by 180°.

In both "Non-Spring" user modes the Retroverb does not create a Spring Reverb effect, but one can treat the input signal with the EQ, VCF and VCA sections - creating typical (or unusual) Filter and Tremolo Effects. When using Phase reversal in modes 2 and 4 you will perceive a wider stereo image, due to the random annulments of frequencies.


First of all after the Spring Reverb is the two band Equalizer which can raise or lower Bass and High frequencies by 15dB. The Equalizer (like all the following sections) works explicitly on the effected signal. In the "Spring" user modes the reverb sound will always be effected. Already at this point in the signal chain, the effect can be strongly influenced and shaped to your sonic needs.

VCF / VCA Section

In this section you can make the most influential manipulations to the effected sound. First the signal runs through a resonant 12dB-low pass filter which can filter out the high parts of the signal. To add some movement into the game, the CUTOFF Frequency can be modulated by the integrated Envelope Generator, or by an external foot-pedal or other voltage controlled source.

After the Filter follows the Voltage Controlled Amplifier (VCA). Here the dynamics of the Reverb ("Spring-Mode") or input signal ("Non-Spring-Mode") can be changed. You can also use the Envelope Generator to modulate the VCA.

Envelope Generator

For some highly dynamic movement to your audio signal there is the Attack and Decay Envelope Generator, which can be triggered in four different ways:

  • Input signal: The envelope will be triggered by a specific level at the input stage, the sensitivity of which can be set with the TRIG. SENSE dial.
  • Audio Trigger/Gate Signal: The envelope can be triggered by a second audio signal or a 5V-Gate Signal connected to the rear side of the Retroverb.
  • Internal Metronome (Clock): The internal Clock triggers the envelope periodically. So you get a kind of LFO which the Attack and Decay can be individually set to.
  • Foot-switch: An additional connection on the rear side of the unit allows you to connect a standard foot-switch to manually trigger the envelope.

Only through the connection to the Envelope Generator can the real potential of the VCF and VCA sections be fully realised. From effects similar to delays, cut reverb tails or reversed reverbs up to tremolo, auto wah and much more - everything is possible.


A special and unique feature is the CRASH-Function. You can safely achieve the popular "Thunder-Effect" produced when a guitar combo fitted with a spring reverb is kicked. With the Retroverb one gets the effect without any physical pain, very simply by a button press, foot-switch, CV Gate or Audio-Trigger.

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