BVR Instruments BASS DRUM User manual

BASS DRUM
Manual

The Bass Drum is a versatile drum module designed
to recreate the iconic bass drum sounds of the 808
and 909 drum machines and more.
It includes a side-chain compressor for seamlessly
blending external audio sources with the bass drum
sound.
This module offers external controls for modulating :
Envelop, Pitch, and Waveform.
Two main outputs: "
One for bass drum, with compressed signal. "
Another one for compressed signal alone.
One input to trig the bass drum.
Bass Drum

Drum signal path
The primary triangular oscillator passes through a wave-
shaper that has a slider for adjusting the triangle waveform
gradually to a square wave.
A click generator is also present, featuring a slider to
control the intensity of the click.
Both Signals are routed to two separate VCA."
BD is the main output and controlled by Level Slider
The bass drum includes a «#Decay#» slider for drum's duration. "
Additionally, external CV«#Env#» provide extra control through
an external envelope or modulation source.
«#Snap#» potentiometer introduces an extra frequency
component that decreases with «#Decay#», creating an
impactful waveform characteristic in 909-style sounds.
On the contrary, setting «#Snap#» to 0 maintains the initial
«#Tone#» setting#without altering pitch, resulting in a sound
reminiscent of 808-style drums.
The main oscillator offers two controls: «#Tone#» and «#Snap#».

Side-Chain signal path
The integrated optical side-chain compressor is fed
with and external audio source connected to «#Ext In#».
The bass drum envelope signal controls the shape of
volume reduction, the «#SideChain#» potentiometer
determines the extent of this reduction.
The «#Level#» potentiometer is used to adjust the
output signal after reduction.
By using «#Mix Ext#» slider,#you can blend the
compressed signal with the primary bass drum
output «#BD#».
The «#Ext Out#» provides the full signal without the
influence of the drum's sound.

Electrical
Full analogue Eurorack module with OTA based amplifiers for VCO and VCAs."
Compressor and Wave-shape use RoHS compliant Opto-Transistors.$
Voltage-Controlled Oscillator (VCO) has a frequency range from 0 to 108Hz which can be externally
controlled with CV.$
Voltage-Controlled Amplifier (VCA) features an «#Env#» (envelop) control voltage input, which can be
can be externally modulated with CV.$
The WaveShaper features a WaveShaper control, which can be externally modulated with CV."
Note: Wave#slider change gradually the waveform from triangle to square wave with more harmonics."
Note: Wave slider controls the percentage from 0 to 100% of applied external signal on
«#WaveShape#» CV. "
Controls
2 potentiometers with center positions for Tone#and Snap#. "
2 potentiometers for SideChain amount and Level#volume."
5 sliders for Decay,#Wave, Click, Level, Mix Ext. "
Inputs
CV inputs: Trig trigger the Bass Drum, Ext In#receive Audio signal to be compressed."
CV modulators: WaveShape, Env#and Pitch responds to voltage from 0 to 5V. "
Note: Pitch CV does not respond to 1V/Octave."
Note: Audio signals can be used as modulation sources to Pitch,#Env#and#WaveShaper."
Outputs
Ext Out#: Outputs compressed signal only."
BD#: Main output."
Size
10HP."
Front panel"
Aluminium, Black."
Power consumption
16 mA @+12V.$
12 mA @-12V.$
0 mA @5V."
$
Depth"
22 mm.
Specifications