Tiptop Audio BD909 Handleiding
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User Manual
BD909

Introduction.
2
The BD909 is a recreation of Roland's TR-909 analog bass drum sound generator
adapted for modular synthesizer use. The front panel contains all of the controls
found on the original TR-909 drum machine, allowing you full control over the
sound’s volume levels to mix with other drums and accent levels, decay tune and
the envelope attack and decay segments. In addition to those original controls we
have also added new controls, further enhancing this legendary sound generator.
Let’s get started.
To start using the BD909, just plug a gate signal into the GATE input, plug the BD
OUT to your sound system, set the LEVEL half way, set the Overload knob to min,
set the ACCENT to halfway.
Tuning explained.
The BD909 contain three tuning control knobs plus a VC tune with attenuator knob
for scaling the control signal. This wide range of tune shaping enhances the original
circuit, turning it into a real analog bass drum laboratory. The OSC TUNE knob is
there to let you offset the starting and ending frequency of the bass drum sound.
The Tune Decay is the original tune knob found in the 909 machine but with a
slightly extended range. The Tune Attack is a new control which not only adds
variation to the sound, it also affects the Tune Decay knob, therefore creating
many more sweet spots than found on the original. The combination of these three
knobs are the main synthesis tools of the BD909.
Overload explained.
The BD909 is based on a triangle VCO and a sine wave shaper that filters the
triangle harmonics and producing a wave which sounds more like a sine wave.
The overload knob and CV input form a control circuit that was added to the
waveshaper, letting you overload the waveshaper circuit, therefore adding more
odd harmonics to the wave shape. In low doses this means more punch, and
as you keep overloading, the sounds get distorted up to total destruction.

3
Accent and Levels:
Dynamic Accent and Level control of any drum sound in the mix is a big part of
making a beat sound right. Dynamic Accent provides emphasis on a particular note
through loudness. In analog circuits like the BD909, the accent pulse physically
"hits" the internal envelope circuit harder and provides not only a louder sound but
also slightly more attack (much like if you were to hit a real bass drum harder
with a drum stick.)
While the original 909 has one global accent knob for setting accents levels for all
of its sounds, the BD909 (and all other drum modules in this series) offers an
independent accent level control. This feature adds to richer dynamics
than what was possible with the original machine.
Accent Explained:
The accent input can be driven by either a gate/trigger or CV signal.
While the accent input is not in use, the incoming gate input is routed
(normalized) to both the accent input and the gate input. This serves for two
purposes:
1. To allow you to reach the hottest drum sound possible even when there is no
accent input signal connected.
2. It makes the ACCENT knob act as a fine control of the output gain level. This
is very useful in situations where the level knob range is too coarse for setting
precise levels in a mix with other drum sounds.
Connecting a gate or CV signal into the accent input will break the internal routing
mentioned above and will allow for independent control over accent regardless
of the incoming gate signal. In this case as long as there is no accent signal
present, the drum sound will be set to the minimum accent level set internally,
and once the accent input gets hit by a gate or CV signal, the drum sound will get
louder in proportion to the accent level set by the accent knob. In short: the
higher the knob setting, the larger the difference will be in gain levels between
the accented notes and the un-accented notes. Using CV allows for even greater
variations.
Dynamics and Gain.
Product specificaties
Merk: | Tiptop Audio |
Categorie: | Niet gecategoriseerd |
Model: | BD909 |
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