User Manual

– Mic Distance: adjusts the distance between the microphones and the cabinet.
A longer distance results in more sound dispersion, a shorter distance results in
a deeper proximity effect.
– Horn EQ: not all vintage rotary speakers have the same quality for what
concerns the sound coming from the horn, some are brighter, some are duller
or maybe just well balanced. This parameter lets you adjust the treble response
of the horn sound.
– Mid reflections: adjusts the amount of sound reflections happening in the
middle of the stereo field.
– Doppler intensity: the so called “Doppler” effect is the fundamental of the
“Leslie” effect that causes the sound to be cyclically untuned while the sound
source (the speaker) gets farther or nearer to the listened; this parameter lets
you adjust the amount of this effect that is mostly caused by the sound
reflections over the walls around the amplifier.
– Dry Leak: some of the dry sound coming from the speakers does not reach the
rotating elements and is mixed with the rotating sound. Use this parameter to
adjust the amount of dry signal you want to be mixed in.
– Bass Port: a real Leslie cabinet has a hole in the back that serves for two
reasons: 1) lets the heat from the motors ventilate out from the cabinet and 2)
acts as a bass tuning port, like those found on modern speakers. If you put a
microphone in front of this hole you get nothing but sub-bass frequencies. Use
this parameter to adjust the amount of sub-bass you want to get into the mix.
– Tube feedback. This is a very important parameter that works on an aspect of
the whole amplification system that can drastically vary both the dynamic
response and the frequency response, as well as have an impact on the
overdrive. When a Leslie cabinet is set very close to the Hammond organ and is
played at a high volume, there's some sort of feedback between the tubes, the
transformers and the pickups of the Hammond and the speakers of the Leslie,
resulting in a sound that tends to get “fatter”, the attack is “punchier” and the
distortion is aggressive, giving you the feeling that some sort of energy is
looping between the organ and its amplifier. Now, a genuine Leslie 122 or 147
is only 40W of power, but if you try to connect your Hammond organ to a 100W
guitar amp such as a Marshall JCM900 or a Fender Twin you'll notice that the
amp starts going in feedback even if you don't play any note on the organ. This
is... pure analog power! Try this parameter at small steps, it can drastically
change the sound in both a pleasant or unpleasant way, according to your
tastes.
CRUMAR MOJO DESKTOP USER'S MANUAL - Page 15/20