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3 Anti-Simulation Reverb Algorithms
STEREO ROM is an experimental reverb for the eurorack system. Like its origin DRAUME this is an exploration of artificial reverberation. Can a space sound dry, old, veiled or broken? Reverberation is typically associated with physical spaces or objects. A hall reverb should conjure the mental image of a hall, but what ambiance comes to mind when presented with intentionally artificial reverberation? ROM combines post-reverb processing with decay and system clock control to break the spatial illusion.
A eurorack offshoot of the DRAUME reverb pedal. ROM/DRAUME is an exploration of artificial
reverberation. Can a space sound dry, old, veiled or broken? Reverberation is typically associated with
physical spaces or objects. A hall reverb conjures the mental image of a hall, but what ambiance comes
to mind when presented with intentionally artificial reverberation? ROM combines post-reverb
processing with decay and system clock control to break the spatial illusion!
PARAMETERS
MIX: Dry/wet mixer. Clean audio at min. Completely processed audio at max. This parameter affects
all three outputs (left, right and sum).
DECAY: Sets the duration of the reverb decay. At max you have several minutes (or more) of decay
time. If you continuously input audio while DECAY is at max you will eventually end up with a
distorted signal as the incoming audio endlessly stacks on top of itself.
CLK: Digital signal processor system clock frequency. Sets the sample rate from 12kHz to 48kHz.
This has the effect of affecting the reverbs character and decay time as well as the modulation speed of
the AM function and the brightness of the TXT function. Adjusting the clock frequency also pitch shifts
whatever audio is currently reverberated. Note that low CLK settings will decreased the signal-to-noise
ratio.
FM: Random system clock modulation depth. This produces a random vibrato effect. The effect is
similar to the old (mono) DRADD modulation but has more depth available. Note that CLK does not
affect the speed of the FM function.
AM: Random amplitude modulation depth. Adds a kind of flickering uncertainty to the reverb
dynamic. The tremolo is applied post-reverb.
TXT: Simultaneously adds low pass filtering and an oddly pleasant digital distortion post reverb.
Audio In/Out: IN L/R are the audio inputs. The inputs are linked such that a mono signal source can be sent to both channels by connecting to just one of the inputs. OUT L/R are the main audio output.
Additionally there is a SUM (L+R) output that combines the processing of the two channels.
CV control: The parameters CLK, FM, AM, TXT and DECAY can be controlled through cv. When cv is applied the associated knobs act as parameter offsets. With a knob set to noon adding a ±5v CV signal will access the parameters full range. Note that the AM, TXT and DECAY inputs are lowpass filtered meaning they won’t respond to rapid LFOs or audio rate signals. The CLK and FM inputs are less filtered thus they somewhat respond to LFOs and sub/bass audio. MIX can not be controlled with cv.
Toggle switch: Algorithm selector. Chose between HALL, FRAME and GRAIN.
HALL algorighm: This is an artificial, thinly veiled “hall” reverb. Maximum decay is approximately 10 minutes with CLK at noon. This is the same base reverb as found in the DRAUME pedal.
FRAME algorithm: Origin as a truly sorry attempt at simulating a piano frame. A cold, lifeless decay
almost devoid of character with absolutely no pre-delay (at least not from the reverb, FM still applies
some small latency depending on the CLK setting). At higher DECAY settings it kinda gives spectral
freeze-associations. Note that with DECAY set to minimum the reverb disappear completely giving you
“clean” access to the FM, AM and TXT functions.
GRAIN algorithm: A granular synthesizer performing random grain shuffling in combination with
regenerated all-pass filters. The system contains 2 simultaneous grains per channel. The all-pass filters
have the effect of gradually smearing the reverberated audio over time making the reverb decay
gradually less jumpy/restless.
Stereo processing: The two channels are tuned differently for improved stereo width. The base reverb
algorithms have separate voicings but most noticably the AM function and the GRAIN shuffling
function have independent random generators, meaning the results from these functions will differ
between the two channels.
TECHNICAL SPECIFICATIONS
Input Impedance 100kΩ
Output Impedance 1kΩ
Power supply Eurorack ±12V DC (5x2 pin type)
Current Draw 200mA (+12V), 40mA (-12V)
Width 60.5mm : 12HP
Height 128mm : 3U
Interior depth 28 mm
Exterior depth 23 mm
Weight 150 g
