Operation Manual

DR. REX LOOP PLAYER
191
! Note that the Filter Frequency parameter is usually controlled by the Fil-
ter Envelope (see page 191) as well. Changing the Filter Frequency with
the Freq slider may therefore not produce the expected result.
Resonance
The filter resonance parameter affects the character of the filter sound. For lowpass
filters, raising the resonance will emphasize the frequencies around the set filter fre-
quency. This produces a generally thinner sound, but with a sharper, more pro-
nounced filter frequency “sweep”. The higher the resonance value, the more resonant
the sound becomes until it produces a whistling or ringing sound. If you set a high
value for the resonance parameter and then vary the filter frequency, this will produce
a very distinct sweep, with the ringing sound being very evident at certain frequencies.
• For the highpass filter, the resonance parameter operates just like for the lowpass
filters.
•When you use the Bandpass or Notch filter, the resonance setting adjusts the
width of the band.
When you raise the resonance, the band where frequencies are let through (Band-
pass), or cut (Notch) will become narrower. Generally, the Notch filter produces
more musical results using low resonance settings.
Envelope Section
Envelope generators are used to control several important sound parameters in ana-
log synthesizers, such as pitch, volume, filter frequency etc. In a conventional synthe-
sizer, envelopes govern how these parameters should respond over time - from the
moment a note is struck to the moment it is released. In the Dr.Rex device however,
the envelopes are triggered each time a slice is played back.
There are two envelope generators in the Dr.Rex, one for volume, and one for the filter
frequency (and/or pitch). Both have the standard four parameters; Attack, Decay,
Sustain and Release
! Please refer to the Subtractor chapter for a description of the basic enve-
lope parameters.
Amplitude Envelope
The Amp Envelope governs how the volume of a slice should change over time, from
the time it is triggered (the slice note starts) until the slice note ends. This can be used
to make a loop more distinct (by having a snappy attack and a short decay time) or
more spaced-out (by raising the attack time).
The Level parameter acts as a general volume control for the loop.
Filter Envelope
The Filter Envelope can be used to control two parameters; filter frequency and over-
all loop pitch. By setting up a filter envelope you control how the filter frequency and/
or the pitch should change over time for each slice.
The Amount parameter determines to what degree the filter frequency will be affected
by the Filter Envelope. The higher the Amount setting, the more pronounced the effect
of the envelope on the filter.
✪ Try lowering the Frequency slider and raising Resonance and Envelope
Amount to get the most effect of the filter envelope!